1: Banners waving in British position (15)
2: A sample makes sense (5)
3: Rejected, for the most part, unlikely chance to buy rubbery substance (9)
4: Come round again about dog (5)
5: Neil lost a letter and ended up with nothing (3)
7: Stealing off, Tito? Earth-shattering to be grieving over (6,2,2,5)
9: Name of place where cat ate a little horse? (7)
11: Take Chair in university (3)
12: With diverse amendments? (7)
14: West abandoned mortals without a spot of confusion (9)
16: Freshen the atmosphere (3)
18: Mousy girlfriend loses head and bellybutton (5)
19: Thick maple growing wild (5)
21: Chump getting past in chasm (5)
23: Age of neo-catastrophe? (3)