1: Sikh leader grovels or doodles! (7)
5: Dilapidated sofa contained initially some hot embers: something's burnt remains. (5, 2)
8: Martyr fighting segregation (5,6)
10: Perform part of play (3)
11: A sample makes sense (5)
12: A group of notes! (7)
13: Equips for attacks (4)
15: Inspects old radical for a moment (5, 6)
16: Hang back, keeping right next to person buying a jumper (11)
21: Ran into a section of the time-table (3)
22: Bud tore angrily into Thomas, for one (7)
23: Mister T ignored Scrooge (5)
25: Take a turn or a thousand dollars (3)
26: 27-across about starting off 1-down world unconditionally (2,3,2,4)
27: They try canopies (7)
28: Grant again drew one crookedly (7)