Across
Hit first button - ultimately receive gift (7)
I haven't cracked this one yet — but Fifteensquared have:
PRESS 1 (=hit first button, cryptically) + <receiv> E (“ultimately” means last letter only)
Get through article about sport? On the contrary (7)
Island creature flightless bird caught between both sides (5)
I haven't cracked this one yet — but Fifteensquared have:
EMU (=flightless bird) in L R (=both sides, i.e. left and right); lemurs are animal species endemic to the island of Madagascar
Unimportant Nationalist in government for only a brief time? (9)
Government-appointed businessman sadly wrong about America investing in US money (10)
I haven't cracked this one yet — but Fifteensquared have:
[A (=America) in *(WRONG)] in CENT (=US money); “sadly” is anagram indicator; according to Chambers , a crown agent is one of a British body of business agents operating internationally, appointed by the Overseas Development Administration
Surprise publicity event not carrying through (4)
I haven't cracked this one yet — but Fifteensquared have:
STUN <t> (=publicity event); “not carrying through” seems to suggest that the word is incomplete, hence the last letter is dropped
Turned on tense and worried? Write music (6)
Youth? Fresh years including golden one (8)
I haven't cracked this one yet — but Fifteensquared have:
[OR (=golden in heraldry) + I (=one)] in [MINT (=fresh, pristine) + Y (=years)]; minority means the state of being under the age of majority, hence “youth”
Entertainment penning lines linked to low aspect of heavenly body (8)
I haven't cracked this one yet — but Fifteensquared have:
[LL (=lines) + MOO (=(to) low, of cattle)] in FUN (=entertainment)
Irregular Judge old accepting $ (6)
I haven't cracked this one yet — but Fifteensquared have:
J (=judge) + [G (=$1000, i.e. grand) in AGED (=old)]; a jagged edge is an irregular one
Thus good is enshrined in lead character though not at first (4)
Dressed up cellars bringing in touch of hope - no longer this? (10)
I haven't cracked this one yet — but Fifteensquared have:
H <ope> (“touch of” means first letter only) in *(UP CELLARS); “dressed” is anagram indicator; sepulchral means funereal, gloomy, dismal, so no longer describes the atmosphere when the cellars are “dressed up” with “a touch of hope”!
Source of disease: cure a bit tricky needing months (9)
I haven't cracked this one yet — but Fifteensquared have:
*(CURE A BIT) + M (=months); “tricky” is anagram indicator
Shout about a very intimidating presence (5)
I haven't cracked this one yet — but Fifteensquared have:
[A + V (=very)] in HEY (=shout, to attract attention); a heavy is a strong man employed to intimidate others, hence “intimidating presence”
Associate of Arthur held after party (7)
Told about particular backsliding one being allowed to escape (7)
Down
Large bird in lake one tucking into nut (7)
I haven't cracked this one yet — but Fifteensquared have:
[L (=large, in sizes) + I (=one)] in PECAN (=nut)
Guy looking up dismissing a tree (3)
I haven't cracked this one yet — but Fifteensquared have:
M <a> LE (=guy); “dismissing a ” means letter “a” is dropped; “looking up” indicates vertical reversal
Bound to have married during relationship in October down under? (10)
I haven't cracked this one yet — but Fifteensquared have:
SPRING (=bound, jump) + [M (=married) in TIE (=relationship, link)]; when it is autumn (=October) in Europe, it is spring in Australia and New Zealand
Praise upholding Christmas omitting line about fireplace item? (6)
Hang on - about to leave Holland in a French carriage? (8)
I haven't cracked this one yet — but Fifteensquared have:
[GO (=to leave) + NL (=Holland, i.e. the Netherlands)] in WAIT (=hang on); a wagon-lit is a sleeping carriage on a train, in French
A latitude supported by tenor over another singer (4)
I haven't cracked this one yet — but Fifteensquared have:
A + L (=latitude) + T (=tenor) + O (=over, on cricket scorecard)
Attitude when occupying height: scaffolder ready to go off at any moment (11)
I haven't cracked this one yet — but Fifteensquared have:
[AIR (=attitude, aura) + HT (=height)] + RIGGER (=scaffolder); according to Chambers , when used adjectivally, hair-trigger means “responding to the slightest stimulus”, hence “ready to go off at any moment”
Former Queen upset business sacking leader in interim period (7)
Record of performance in unusual location regarding essential study? (11)
See company attending house surrounded by barrier promising no drunken antics? (10)
I haven't cracked this one yet — but Fifteensquared have:
LO (=see, as exclamation) + {[CO (=company) + HO (=house)] in WALL (=barrier)}
Sweetheart or duck in crossword terms? (8)
I haven't cracked this one yet — but Fifteensquared have:
Cryptically (“in crossword terms”), “duck” could be clued as “lovebird” since “duck” is a zero score (in cricket), like love (in tennis), as well as a bird!
Complaint raised about Democratic Attorney-General’s source of eats (7)
I haven't cracked this one yet — but Fifteensquared have:
[D (=democratic) in FEEB (BEEF (=complaint, moan); “raised” indicates vertical reversal)] + AG (=Attorney-General)
Guided up? Yes getting day behind schedule (7)
The whole attraction of Nice say in warmer period (6)
Part of some shimmering feature of lingerie? (4)
Rising cheers surrounding Conservative legislation (3)
Type letters or click words in the clue