1 Anagrams

2 Down in the dumps

3 A casual photo

4 Do this and kiss

5 A mentally unstable milliner from fiction

6 A traditional caper

7 He works hard in the kitchen?

8 It’s not healthy here

9 Hitler's dream

10 Bacteria

11 Remained inert, we hear

12 American flowers

13 Both can be cast

14 A U.S. region

15 A financial street

16 Numbers

17 Two with ‘plate’

18 Sweet

19 Candid

20 A slip road in London?