Across
Immediately suggestive of boater going down? (2,3,4,2,1,3)
Fail in attempt to maintain break? (2,2,3)
Be enough for holding popular strike (3,4)
Certain to miss holiday handout on island (3)
Energy discharging around wharf, making a racket (3-8)
I haven't cracked this one yet — but Fifteensquared have:
E (energy) + ARCING (discharging) round PIER (wharf) (It took me a long time to think of looking up the unlikely-looking ARCING, which I couldn’t explain: ‘Arcing is a type of electrical discharge that occurs when electrons flow between two conductors, usually metal, in an environment with a gas or vacuum. The conductors can be wires, rods, or other objects that are capable of carrying an electrical current.’)
Bland caper occurring around start of month (10)
I haven't cracked this one yet — but Fifteensquared have:
ANTIC (caper) round SEPT I (start of month)
A lot of cane turned into a cot (4)
Eat out: get Chinese (just a serving thereof) (4)
Significant eccentricity observed in bloke in Gulf working (10)
Informal market offering mostly crap, perhaps: footwear, booze (3,4,4)
Live backing group appearing in later audition — an historic time (3)
Soprano wrong to interrupt French king and composer (7)
I haven't cracked this one yet — but Fifteensquared have:
S (soprano) + SIN (wrong) in ROI (French king)
Unruly Second Sex recalled in French fantasy? (7)
I haven't cracked this one yet — but Fifteensquared have:
S (second) + a reversal (recalled) of IT (sex) in RÊVE (French for dream, fantasy)
Off-colour article repeatedly found amongst lingerie? (5,3,7)
I haven't cracked this one yet — but Fifteensquared have:
THE (article) repeated in UNDER (THE) WEA(THE)R (lingerie)
Down
Pin-up about to tuck into a lot of raw food (5,4)
I haven't cracked this one yet — but Fifteensquared have:
Apart from a reversal (up) of LEG (pin) + C(A?) (about), I can’t make anything of this Edit – thanks to KVa and Alan C: a reversal (up, in a down clue) of LEG (pin) + C in A lot of NAKE[d] (raw)
Old left-winger is in grip of drink after upholding the very thing (7)
I haven't cracked this one yet — but Fifteensquared have:
IS in TOT (drink) after a reversal (upholding) of IT (the very thing)
Crowd in rear of brasserie getting very good coffee (8)
I haven't cracked this one yet — but Fifteensquared have:
PRESS (crowd) in [brasseri]E + SO (very good?)
I will avoid disturbance, or location of revolution (5)
I haven't cracked this one yet — but Fifteensquared have:
R[i]OT (disturbance) minus i + OR – and ROTOR is a palindrome
I follow it through first bit, but not the last section (9)
I haven't cracked this one yet — but Fifteensquared have:
I after IT in PART ON[e] (first bit) The cryptic grammar (I follow) doesn’t quite work here – a pity, since the setter dealt with I effectively in the previous clue and in 8dn
Good things to be put on penalty lines (6)
More convenient, that is, with Chinese doctor coming round (7)
I haven't cracked this one yet — but Fifteensquared have:
HAN (Chinese) + DR (doctor) round IE (id est – that is)
Skimpy swimsuit: object I discarded in favour of nothing (5)
I haven't cracked this one yet — but Fifteensquared have:
TH[i]NG (object) with the i discarded in favour of O (nothing)
Priest upset with Welsh occupying church in Mancunian town (9)
I haven't cracked this one yet — but Fifteensquared have:
An anagram (out) of CREWS HIT after P (pressure) – but the Glasgow Airport is Prestwick : Prestwich is a town in Greater Manchester
Singer, a large guy, tucking into booze (9)
I haven't cracked this one yet — but Fifteensquared have:
A L (large) LAD (guy) in BEER (booze)
Submarine dunes are dispersed (8)
Large body of French turned up, collapsed in laughter (7)
Belgian? Flaw sees Belgium replaced by France (7)
I haven't cracked this one yet — but Fifteensquared have:
[b]LEMISH (flaw) with the b (Belgium) replaced by F (France)
One repeats surprised comment about dessert (6)
Chapter Four about the Durrells' home? (5)
It delivers arrival that hurts! (5)
Type letters or click words in the clue