Carpentry rod (5)
I believe the answer is:
dowel
'carpentry rod' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dowel that I've seen before include "Peg for joining wood" , "Lowed (anag.)" , "Peg used in joinery" , "Short peg used as a fastener" , "Peg used for fastening two adjacent parts of a structure" .)