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? (4,4)
-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)
-20. assert without proof (6)
-21. exit (6)

2. Jack Paar

3. cannon

5. Glowworm

1. decrease E

21. egress S

Hi Cue.

10 - radii

9. Haggis - Hi Cue

Bernie

Good start

Curly, I'll take egress, but decrease doesn't fit the puZZle

Hi Bernie

29. (19) buzzard
20. allege

That's the new match, Lex

#20 is a fitting clue for you

17. kazoo

12. Mecca

15. vacuum

13. Eerie
16. Adder

18 - jimmy

1. withhold

Simply perfect!

Keep it going...

4. floppy

14. bitter

8. baffle

That's three more

6. rabbet

Hi Cue.

Yoda was reviewing your answer and he told me "Right you are"...

11. jackknife

11. jackknife

too late...I'll try

7. ferret

Good puzzling!