Across
Show appreciation of program with two-fold backing (7)
I haven't cracked this one yet — but Fifteensquared have:
APP (APPLlcation; a computer program) + DUAL (two-fold) reversed (backing)
Wipe out leaders of triads breaking from espionage (6)
I haven't cracked this one yet — but Fifteensquared have:
ESPIONAGE is made of three blocks of three letters (triads). If you exclude (breaking from) the first letter (leader of) of each block of three letters, E SP , I ON and A GE you are left with SPONGE
Have a go at shifting seconds, selling wall cladding (10)
I haven't cracked this one yet — but Fifteensquared have:
PAN (criticise; have a go at) + S ELLING (with the S [seconds] moved to the end [shifting]) to form ELLING S
Hot sun provided turning angle (4)
I haven't cracked this one yet — but Fifteensquared have:
( H [hot] + S [sun] + IF [provided]) all reversed (turning)
Rash complaint initially elicited, caught by winding maze (6)
I haven't cracked this one yet — but Fifteensquared have:
E ( first letter of [initially] E licited ) + C (caught) + an anagram of (winding) MAZE
Cut out about ... about ... about ... and make trim? (8)
I haven't cracked this one yet — but Fifteensquared have:
EXCISE (cut out) containing (about) ( RE [with reference to; about] reversed [about])
Gave another relation one half of secret antique (6)
I haven't cracked this one yet — but Fifteensquared have:
RET ( second 3 of 6 [half] letters in sec RET ) + OLD (ancient)
An element of developing maturity though not absolute (7)
I haven't cracked this one yet — but Fifteensquared have:
Anagram of (developing) M A TURITY excluding (not) A (absolute)
Perhaps the place to find dates in a computer (7)
I haven't cracked this one yet — but Fifteensquared have:
PALM TOP (the TOP of a PALM tree is a place to find dates)
Blasted exams before start of summer seasons? (6)
I haven't cracked this one yet — but Fifteensquared have:
Anagram of (blasted) EXAMS + S ( first letter of [start of] S easons)
Part of terrain was heavy accompaniment to run-off (8)
I haven't cracked this one yet — but Fifteensquared have:
RAINWASH ( hidden word in [part of] TER RAIN WAS H EAVY)
A tiny piece of delicately confected cake (6)
I haven't cracked this one yet — but Fifteensquared have:
Anagram of (confected) A TINY and D ( first letter of [piece of] D elicately)
Music by The Stones? (4)
I haven't cracked this one yet — but Fifteensquared have:
ROCK (stones are a form of ROCK ) double definition
How to worship a sort of noble deity? (10)
Rusty subframe perhaps is an inducement (6)
I haven't cracked this one yet — but Fifteensquared have:
CAR ROT (descriptive of the effect of a rusty subframe of a vehicle, for example)
Retired white somewhere on vacation died, slipped away (7)
I haven't cracked this one yet — but Fifteensquared have:
PALE (white) reversed (retired) + SE (l etters remaining in S OMEWHER E when the central letters OMEWHER are removed [on vacation]) + D (died)
Down
Touring capitals, an artist’s song to the Chilean pine (9)
I haven't cracked this one yet — but Fifteensquared have:
( A [an] + RA [member of the Royal Academy of Arts; artist] + ARIA [song]) containing (touring) UC (upper case; capital letters)
Reorganise prep etc as a rule (7)
A welcome forecast for bad weather? (7)
I haven't cracked this one yet — but Fifteensquared have:
ALL HAIL (if the weather forecast is simply ‘ ALL HAIL ‘ , then there is going to be bad weather)
Nude swimming round banks of divine coastal city (6)
I haven't cracked this one yet — but Fifteensquared have:
Anagram of (swimming) NUDE containing (round) DE ( outer letters of [banks of] D ivine E )
Maybe he’s wanted distinctive feature to be adopted by cult (7)
I haven't cracked this one yet — but Fifteensquared have:
USP (Unique Selling Point; distinctive feature) contained in (to be adopted by) SECT (a form of cult)
Cop runs off with diamonds, which is out of order (7)
I haven't cracked this one yet — but Fifteensquared have:
Anagram of (out of order) R (runs) OFF and [with] ICE [diamonds)
Lots of wind beginning to surge in bowels (5)
I haven't cracked this one yet — but Fifteensquared have:
S ( first letter of [beginning to] S URGE) contained in (in) GUTS (bowels)
It’s associated with meal cooked at one end of office (3)
I haven't cracked this one yet — but Fifteensquared have:
Anagram of (cooked) AT and O ( letter at the beginning [one end of] O FFICE)
It’s associated with meal cooked at one end of office (3)
I haven't cracked this one yet — but Fifteensquared have:
TEA (something associated with a meal, or even a meal in its own right)
Unoccupied land is so outstanding (9)
I haven't cracked this one yet — but Fifteensquared have:
UNSETTLED (descriptive of a payment that has not yet been paid; outstanding) double definition
Overheard girl’s nickname (7)
I haven't cracked this one yet — but Fifteensquared have:
MONIKER (sounds like [overheard] MONICA [girl’s name])
Vaguely inferior oats for getting mashed (2,1,4)
Rich wine produced on island right by top of Africa (7)
I haven't cracked this one yet — but Fifteensquared have:
MADE (produced) + I (island) + R (right) + A ( first letter of [top of] A frica)
Slides across the snow, kissing ground (7)
Beneath heading in Chambers he’s about to look up ‘mousetrap’ say (6)
I haven't cracked this one yet — but Fifteensquared have:
C ( first letter of [heading] C hambers) + ( HE containing [about] SEE [look] reversed [up; down entry])
A not quite high-bridged nose (5)
I haven't cracked this one yet — but Fifteensquared have:
A + ROMA N (round and bold [high-bridged] description of a nose) excluding the final letter (not quite) N
Type letters or click words in the clue