Threaded fastener (3)

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nut

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

This is all the clue.

(Other definitions for nut that I've seen before include "organized teachers" , "Hard-skinned fruit" , "eccentric type" , "Large, hard-shelled seed" , "eg Almond, brazil" .)

I've seen this clue in the LA Times and The Sun.

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