Crossword Genius

Head that may be turned (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 remainder of the clue works.

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(Other definitions for nut that I've seen before include "'Almond or cashew, say (3)'" , "1A [CRACKPOT]?" , "needing to get tight?" , "Fan" , "something turned when making fast > food" .)

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