Crossword Genius

Complain at fish (4)

Ross

I believe the answer is:

carp

I believe this is a double definition.

'complain' is the first definition.
(carp can informally mean to complain or whinge)

'fish' is the second definition.
(I know that carp is a type of fish)

'at' is the link.

(Other definitions for carp that I've seen before include "Swimmer" , "Keep complaining" , "Fish < and beef" , "Raise petty objections about goldfish" , "Raise trivial objections" .)

I've seen this clue in The Mirror.
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