1: Finally sweep up piles (50 leaves) of litter (7)
2: 3-down said Sir, I have these! (5,4,4)
3: Age of neo-catastrophe? (3)
4: Record that it was to insult (2,3,4)
5: Silver inside for each calling device (5)
6: Saves and secures stranger (7)
7: Bees encircling trash--back, over, and above (7)
10: Scenery has to get down by starting 12-across (7,6)
12: Anger that is constraining response (3)
14: Type of sketch taken from thin album (9)
16: Italian composer making endless noise, sir (7)
17: Irrigated tree tangled in wad (7)
19: Top card? Excellent! (3)
20: Hack gets brainwave to start with: ripen green veggie (7)
22: Feed all but the first stranger (5)