A bit of a joint (5)

I believe the answer is:

tenon

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'a joint' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for tenon that I've seen before include "Connection" , "One projecting" , "End of a piece of wood shaped to form a mortise joint" , "Shaped end of piece of wood for slotting into a hole." , "Type of hacksaw" .)

I've seen this clue in the Evening Standard.

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