Crossword Genius

Head 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 cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for nut that I've seen before include "Brazil, for instance" , "Hard-skinned fruit" , "eg Almond, brazil" , "Fan" , "Crank" .)

I've seen this clue in the Evening Standard.
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