Carpentry fastener (4)

I think it could be either:

nail

tnut

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

This is all the clue.

(Other definitions for nail that I've seen before include "it needs hammering home" , "Hammer's target" , "Fixing pin" , "Carpentry fastener" , "Catch - fastener" .)

I've seen this clue in The Sun.

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