Dovetail sections (6)
I believe the answer is:
tenons
'dovetail sections' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tenons that I've seen before include "Projections that are fitted into a mortise" , "Shaped ends of pieces of wood to fit into holes" , "Projections that fit into mortises" .)