Down
3
Too old to be useful – duenna tears up (anag) (13)
5
Crunchy stem of an aquatic plant, used in Chinese cuisine (5,8)
6
US actor Al ______, born 1940 (6)
7
Semiaquatic mammals with long tails and webbed feet (6)
12
Part of a strawberry or a boat (4)
17
Hour before midnight or midday (6)
20
Gambler’s chance to double their initial stake (5)