Rounded pin (5)

I believe the answer is:

dowel

(Other definitions for dowel that I've seen before include "Cylindrical fastening pin" , "Fixing peg" , "Headless peg used for joining components" , "Pin that holds two pieces of wood together" , "Peg used for fastening two adjacent parts of a structure" .)

I've seen this clue in the Sydney Morning Herald.

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