Bit of paint (4)

I think it could be either:

Which length description are you looking for?:

dab

'bit of paint' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for dab that I've seen before include "Flatfish; fingerprint" , "Bad kind of fish" , "Expert; flat fish" , "Press gently; flatfish" , "[SOMETHING FISHY]" .)

I've seen this clue in the Newsday.

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