1: The Doors have these so-called musical sessions (5).
2: Fit so much in French drink (7)
3: Debate again, coming from behind and vaguely in the middle (7)
4: The grades of naval seamen (7)
5: Ratty cavalier redressed in proper horseman's uniform. (7, 6)
6: No hot tamale in this dish (7)
7: We hear you cannot pay, so you can't smell. (9)
9: Disbelieving customer found in fetid cell in turmoil. (7,6)
13: Conforming to good taste, I cast thee out (9)
16: No time for metal in name only (7)
17: Pen opening regularly, bearing volatile, flammable liquid (7)
18: Criticise measures in treatment (7)
20: Robert's musical wild animals (7)
23: Pan given back by pastry taster (5)