Burn the fish! (4)

I believe the answer is:

char

I believe this is a double definition.

'burn' is the first definition.
(charring is a kind of burning)

'the fish' is the second definition.
(char is a kind of fish)

(Other definitions for char that I've seen before include "Singe, scorch" , "Overcook - fish - daily" , "Daily cleaner; burn" , "Person who cleans" , "Burn; cleaner; fish" .)

I've seen this clue in the Evening Standard and The Globe and Mail.

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