1: The Doors have these so-called musical sessions (5).
4: Ace practised a lot by female golfer in a state of decline (2,1,3,3)
9: Candy, Rod, Gump all confused (7)
10: Facility left for supporter of the arts? (5)
11: Drive away roofing material before farmhouse becomes a target area (8,5)
13: Broadcast share in genuine show trial (9)
15: Sister leaves, seeing torment of supernatural servant (5)
16: Contrarily accepted gold slab (5)
18: Orbiting object strayed SE a little (9)
20: Clearly notes Earths at a particular compass point (4-5-4)
23: Elected to instruct audit of electronic giant (5)
24: Swimming-pool man to take off? (7)
27: Equus? Shenanigans! (9)
28: Exchange rated poorly (5)