1: Alternative part of course (5)
4: Smorgasbord attendance takes a beating (9)
9: Mixed race had become a farce (7)
10: Something to knock down in the alley for writer at home? Back at home? (7)
11: Go up cedar's first branch (5)
13: Proficient in arithmetic, starting with short division (5)
14: Small piece of fish (3)
15: Watering devices found in run-down orange sheds (6, 5)
17: 15-acrosss toilet pot? Rubbish! (5,6)
19: In all, just a little peak. (3)
21: Biting piece of chocolate with dry exterior (5)
23: Entrance activists en masse (5)
24: Hot and sultry, stripping right in current (7)
25: Fruit is found in waterfalls (7)
26: Supposed hot desire gnawed (9)
27: German painter in a southern state (5)