Trivial complaint (4)

I think it could be either:

Which length description are you looking for?:

nit

'trivial complaint' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for nit that I've seen before include "Foolish person" , "Egg; fool" , "Cause of much head-scratching" , "small egg" , "Louse's egg; idiot" .)

I've seen this clue in the Newsday and the LA Times.

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