Timber cutter (6)
I believe the answer is:
sawyer
'timber cutter' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sawyer that I've seen before include "Boy hero of Mark Twain's novel" , "Woodcutter" , "Cutter of timber" , "Mark Twain character - wood processor" , "One who cuts up timber" .)