Minor criticism (3)

I think it could be either:

Which length description are you looking for?:

nit

'minor criticism' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for nit that I've seen before include "Cause of much head-scratching" , "no egghead?" , "Idiot, ass" , "Louse's egg - berk" , "Parasite's egg made of tin" .)

I've seen this clue in the LA Times, The New York Times, the Universal and The Wall Street Journal.

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