A foolish person (6)

I think it could be either:

Which length description are you looking for?:

nitwit

'a foolish person' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for nitwit that I've seen before include "Silly fool" , "Fool, idiot" , "Informally a stupid person, like funny flea?" , "Twin it with a right eejit" , "Informally, a foolish person, featherbrain" .)

I've seen this clue in the Sydney Morning Herald.

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