2: Tidy up and clean floor finally and decisively (4,3,3,3)
9: A humorous writer or two (5)
10: Top colleges have three miles of vine (3,6)
11: Fish spawn upstream in little orifices (3)
12: Improve me back end (5)
14: Rider in Confederacy's last two campaigns, primarily by inclination (7)
16: A hint for the snooker champ? (3)
17: Vicar regularly outdated technology (1.1.1.)
18: Right, turn right to play with robot (3)
19: Neil lost a letter and ended up with nothing (3)
20: Crazy macabre American authors outside making perfumed hair applications (7)
21: Mark in Russian bar, empty the night before (5)
23: Mediterranean leaves unfashionable coins? (3)
25: Strangely, some limbs suffer from blood clots. (9)
27: Weirdos drop feet-first in pools (5)
28: ...near fishing boats stocked with cold bait (5,8)