Find fault (4)

I think it could be either:

Which length description are you looking for?:

carp

'find fault' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for carp that I've seen before include "Fish - complaint" , "ish" , "Fish; nag pettily" , "Nagging fish?" , "Complain like goldfish" .)

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

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