Across
Family almost broken by contrary leader in unscrupulous monster, Roman emperor (8)
I haven't cracked this one yet — but Fifteensquared have:
I can see CLA[n] (family almost) broken by ALIG (Ali G?) and leader in Unscrupulous but can’t make sense of it, I’m afraid. I knew it wouldn’t take long: please see comments 1 and 2
Religious scholar's brief chat (5)
Grand 7 club (4)
President with a new flat (10)
Foreign children less savage (6)
To the sheltered side, fighting evident between Yorkshiremen? (8)
Insect in tree it damaged, feeding on elm, ultimately (7)
I haven't cracked this one yet — but Fifteensquared have:
An anagram (damaged) of TREE IT round [el]M
Unknown acid so misrepresented in circular diagrams (7)
Only in sacred mantra, I love traditional Neapolitan song (1,4,3)
I haven't cracked this one yet — but Fifteensquared have:
SOLE (only) in OM (sacred mantra) + I + O (love) – an earworm you don’t need a link for
Old Greek king perhaps banking on one retiring (6)
I haven't cracked this one yet — but Fifteensquared have:
MAN (king – chess piece – perhaps) round a reversal (retiring) of ON I (one)
Smooth American painter in small jumper (10)
Good Japanese drink (4)
See 2
Fault in hinge worsening finally, noise coming from behind stable door? (8)
I haven't cracked this one yet — but Fifteensquared have:
An anagram (fault) of IN HINGE + [worsenin]G
Down
Nirvana is featured in show (8)
25a
Pass around clockwise initially, always the other way (4,5)
Penny swallowed by 7 — that's eaten at the end of the day (6)
7 for good measure robed in uplifting colours (7)
I haven't cracked this one yet — but Fifteensquared have:
AND (for good measure) in a reversal (uplifting, in a down clue) of FLAG (colours) – Tolkien’s wizard
Grow old, as 7 (8)
As bouncers edged, rubbish openers helping slip (10)
Great reptile with different head (6)
I haven't cracked this one yet — but Fifteensquared have:
[l]IZARD (reptile) with a different initial letter
7 insect of old (10)
Wicked romp, tale limited in time (8)
7 solving crossword? (8)
7 anchovies, for example? (7)
I haven't cracked this one yet — but Fifteensquared have:
Another double definition
Don't eat in bar round front of restaurant (6)
I haven't cracked this one yet — but Fifteensquared have:
STAVE (bar) round R[estaurant]
7 bird (6)
Part of two hospitals taken up in London area (4)
Type letters or click words in the clue