Quick Crossword #16,540

1

Reckless and self-destructive (8)

2

Nitwit (informal) (5)

4

Good whose maintenance is excessively expensive (5.8)

5

'__ and Day' (Cole Porter song from 1932) (5)

6

Invade in large numbers (7)

7

Someone or something that is successful (4)

8

Protesters posted outside a building during a strike to urge others not to go to work (6)

13

Spectacularly fast (8)

15

Barrier: Complain (7)

16

Officially cancel (6)

18

Tree — nuts — character Watership Down (5)

20

Taupe's friend in The Wind in the Willows (5)

21

Food thickener extracted from seaweed (4)