Flatfishes (4)

I think it could be either:

dabs

rays

'flatfishes' is the definition.
(I know this)

This is all the clue.

(Other definitions for dabs that I've seen before include "Fingerprints (colloq.)" , "Fingerprints (slang)" , "they give evidence to police" , "Fish < experts" , "'Pats at, with a cloth, say (4)'" .)

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

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