Sawn timber (6)
I believe the answer is:
lumber
'sawn timber' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for lumber that I've seen before include "Move awkwardly - unwanted household items" , "Move in ungainly way" , "Sawn timber" , "Sawn wood - be a burden to" , "Wood for building - saddle" .)