Crossword Genius

Head: might that be screwed on? (3)

Ross

I believe the answer is:

nut

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'head' is the definition.
(informal term for somebody's head)

I can't explain the remainder of the clue.

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(Other definitions for nut that I've seen before include "One securing bolt" , "Cashew or hazel" , "organized teachers" , "buff" , "Fan" .)

I've seen this clue in The Times.
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