Across
Ungentlemanly type, even worse with a different leader (7)
I haven't cracked this one yet — but Fifteensquared have:
Changing the “leader” (first letter) would give BASTARD, a worse description than dastard
Stopped working as a model, you could say, getting thrown out (7)
Very little time to look (5)
Clear Number 10 not against being offensive (9)
I haven't cracked this one yet — but Fifteensquared have:
OBVIOUS (clear) with V (against) replaced by NO X
I want a head sacked! Preposterous (4,2,4)
Grand piano, one in church, returned (4)
I haven't cracked this one yet — but Fifteensquared have:
P[iano] I in reverse of CE
Supporter of ex-PM (English not American), one who was recently deported (5,6)
I haven't cracked this one yet — but Fifteensquared have:
BORIS [Johnson] BACKER with the A changed to E. Becker was recently deported from the UK after serving eight months of a 2½-year sentence for tax evasion
Strong drink: another litre abused (8,3)
Means for controlling weather, say? (4)
Dogmatic believers do eulogise insanely (10)
Criminal cross — it's nicer outside (9)
Man recalled daughter featuring in Vogue (5)
I haven't cracked this one yet — but Fifteensquared have:
Reverse of D in RAGE (fashion, vogue)
People divided opinion at the end — are maybe right about society (7)
I haven't cracked this one yet — but Fifteensquared have:
Reverse of OK (right) + ARE* + [opinio]N + S[ociety] – rather a fiddly construction, but I think the order of the elements is indicated correctly if you read the clue carefully
Forest keepers who play in Scotland (7)
Down
Renounce, as police personnel have (6)
Spiritual healer's not a proper one (6)
Philosophical concept analysed as rot, badly (6,4)
Sad it's gone? Not cool, Vlad's loincloth (5)
I haven't cracked this one yet — but Fifteensquared have:
SAD less SA (sex appeal. “it”) + HOT (not cool) + I (Vlad)
Germany's elitist group in China? (6,3)
Producer of Bond cutting introduction: it's rotten (4)
Talked about cheap American trailer (8)
Collectors' vehicle (8)
Tory minister working over rising colleague in hurry (3,1,4,2)
See orders for repairing screens (9)
Extreme nerd — one might pick you up on grammar at first, I'm afraid! (8)
I haven't cracked this one yet — but Fifteensquared have:
UBER (a hired vehicle that might pick you up) + G[rammar] + EEK (I’m afraid!)
Previously left at home in care of nurse (8)
Rob Lowe gutted after fare goes up (6)
I haven't cracked this one yet — but Fifteensquared have:
Reverse of GRUB (food, fare) + L[ow]E
Teacher is following — O God! (6)
Big around end of November and what follows it (5)
I haven't cracked this one yet — but Fifteensquared have:
OS (outsize) + CA (circa, around) + [novembe]R – Oscar follows November in the NATO phonetic alphabet
Mounted enthusiastic female singer (4)
Type letters or click words in the clue