Across
Pastry chef initially getting 10/1 about fantastic mare (5,4)
I haven't cracked this one yet — but Fifteensquared have:
C-[hef] and PUFF the magic (10ac) dragon (1dn); around anagram/”fantastic” of mar Puff, the Magic Dragon is a song by Peter, Paul and Mary [wiki]
What winds up Hilary Mantel at first is absurd (5)
I haven't cracked this one yet — but Fifteensquared have:
“winds up”=’ends’, so the end of [Hilar]-Y; with SILL=”Mantel” first
Government in action is awfully combative (9)
Joe is wearing coat of secret power (5)
Painter contributing to building restoration (6)
Martyr gets upset with 11 (2,6)
I haven't cracked this one yet — but Fifteensquared have:
anagram/”upset” of (gets OGRE)*, with OGRE=11dn
Extremely stupid study tips from Sesame Street (7)
I haven't cracked this one yet — but Fifteensquared have:
DEN=a private room=”study” + outer letters (“tips”) of S-[esam]-E S-[tree]-T
Prickly animal ultimately crossed the road (7)
I haven't cracked this one yet — but Fifteensquared have:
BEAR=”animal” + last letters (“ultimately”) from [crosse]-D [th]-E [roa]-D
Insect almost turned on dog (8)
Island’s relaxed mood embodied by strong punch? (6)
I haven't cracked this one yet — but Fifteensquared have:
anagram/”relaxed” of (mood)*, inside KO (knockout, “strong punch”)
Portion of splendid risotto in Elba? (5)
Resisting nuclear threat after evacuation fails (9)
I haven't cracked this one yet — but Fifteensquared have:
anagram/”fails” of (nuclear tt ), where the tt is t -[hrea]- t after its inner letters are evacuated
Pleased with yourself about answer for 1 down? (5)
I haven't cracked this one yet — but Fifteensquared have:
SMAUG [wiki] is a dragon (1 down) in Tolkien’s The Hobbit SMUG=”Pleased with yourself”, around A (answer)
Ineffective Chopper Harris finally getting in amongst the French (9)
I haven't cracked this one yet — but Fifteensquared have:
TOOTH=”Chopper” (more often, teeth=’choppers’); plus final letter of [Harri]-S inside LES=”the [in] French”
Down
Pull leg of monster (6)
Year ends badly for mother of 1? (8)
I haven't cracked this one yet — but Fifteensquared have:
DAENERYS is known as the ‘Mother of Dragons’ in A Song of Ice and Fire [wiki] anagram/”badly” of (Year ends)*
Pieces of sausage finally eaten by old cat (6)
I haven't cracked this one yet — but Fifteensquared have:
final letter of [sausag]-E inside: O (old) + PUSS=”cat”
Single fellow on short holiday is most dodgy (7)
I haven't cracked this one yet — but Fifteensquared have:
I=one=”Single” + F (fellow) + FIEST-[a]=”short holiday”
Stars bored with acting for Amazon (6)
I haven't cracked this one yet — but Fifteensquared have:
VIRGO=constellation of “Stars”; with A (acting, taking a temporary role e.g. A/Insp for ‘acting Inspector’ in the police) going/boring inside
Year in relationship is going very quickly (6)
Giant conger eel regularly escaping (4)
I haven't cracked this one yet — but Fifteensquared have:
letters regularly removed from [c]- O -[n]- G -[e]- R [e]- E -[l]
Way to swallow English wine (3)
Crouch with header missing target (3)
I haven't cracked this one yet — but Fifteensquared have:
[b]-END=”Crouch” with its head letter missing for the surface reading, Peter Crouch is a footballer who might miss the goal with a header
Female called out for interjection from Homer (3)
I haven't cracked this one yet — but Fifteensquared have:
definition: Homer Simpson’s catchphrase [wiki] sounds like (“called out”): ‘doe’=”Female”
Neither way to leave country (3)
I haven't cracked this one yet — but Fifteensquared have:
NOR-[way]=”country” with “way” leaving
Take shot in game (4)
Lonely lady on vacation for a bit (8)
I haven't cracked this one yet — but Fifteensquared have:
definition in the sense of ‘to a small degree’ as in ‘not remotely interested’ REMOTE=”Lonely” + L-[ad]-Y with the inner letters ‘vacated’
Retiring golfer leading Open prepared to thoughtfully postpone (5,2)
I haven't cracked this one yet — but Fifteensquared have:
definition as in putting off a decision reversal/”Retiring” of Ernie ELS the “golfer” [wiki] ; plus anagram/”prepared” of (Open)*
Swelling sea turns up in opera oddly (6)
I haven't cracked this one yet — but Fifteensquared have:
MED (Mediterranean “sea”) reversed/”turns up”, inside the odd letters of O-[p]-E-[r]-A
Paul in cryptic post? (4,2)
I haven't cracked this one yet — but Fifteensquared have:
anagram/”cryptic” of (Paul in)*
A king turning up without smart shirt (6)
I haven't cracked this one yet — but Fifteensquared have:
definition: a type of shirt worn in India A (from surface) + K (king); together reversed/”turning up” and going around/”without” HURT=sting=”smart”
Language course covering indefinite article (6)
Type letters or click words in the clue