All answers have a letter that's doing double duty. A double of each of the letters shown below can be found in one of the answers.

-1. deduct (8)
-2. an "average" talk show host? (4)
-3. a gun that sounds like a copier? (6)
-4. a type of disc (6)
-5. the Mills Brothers say it glimmers (8)
-6. dado partner (6)
-7. a ransacking animal? (6)
-8. hinder or perplex (6)
-9. a minced Scottish pudding (6)
-10. they're only half of a diameter (5)
-11. a semi mishap perhaps (9)
-12. a religious center or a place that attracts many visitors (5)
-13. it's just spooky (5)
-14. a vetch could be this? (6)
-15. do a household chore (6)
-16. a calculating snake? (5)
-17. a hummer of an instrument? (5)
-18. a crowbar (5)
-19. carrion craver (7) (was 29 )
-20. assert without proof (6)
-21. exit (6)

13. eerie

5. glowworm

17. kazoo

10. radii

18. jimmy

Nice puzzle Cue.

29. buzzard

Good solves everyone

Thanks, Remi.

I see I'm using a new numbering system, michele. Must be part of the new math.

9. Haggis - Hi Cue

Bernie

16. adder

3. cannon

20. Allege

Just checking if you're paying attention Cue.

2. Paar

12.Mecca

21. egress

Excellent solves, as usual.

1. withhold
8. baffle

7.baboon

Two hits, Joan
Haroula, the o's were already used.

4. floppy

15. vacuum

11. jackknife

14. bitter

That's four more out the door. Good solves.

6. rabbet
7. ferret

Don't forget this one, Cue

Nicely polished off, Joan