Part of a carpentry joint (5)
I believe the answer is:
tenon
'part of a carpentry joint' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tenon that I've seen before include "Outstanding" , "Nonet (anag.)" , "Part of a wooden joint" , "Mortise and . . . . ., form a wooden joint" , "Tongue of wood, fits into mortise" .)