Wackadoodle (3)

I think it could be either:

Which length description are you looking for?:

nut

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

This is the entire clue.

(Other definitions for nut that I've seen before include "Screwball" , "Fruitcake" , "Freak" , "Brazil, for instance" , "Crazy person" .)

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

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