1: Part of stair is erect (5)
3: In the act an organ is brought forth (9)
6: Orchestra I'm reorganizing for certain conductor (11)
9: Cull out from top ten (3)
11: Flower festival is pointless (5)
12: Marauder contaminating a pet river (9)
13: Novel deviance in the movie? (5,2,6)
16: Teen unclothes poorly dressed diners (13)
19: It's an odor billowing from Indian dishes (9)
20: Chump getting past in chasm (5)
22: Capture perfect score in review (3)
23: Privy to accessibility (11)
24: Prohibit fanatics grabbing British records showing checks and balances? (9)
25: A girl in distress, sought by knights (5)