Tool for smoothing wood (5)
I believe the answer is:
plane
'tool for smoothing wood' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for plane that I've seen before include "Aircraft - level surface - carpenter's tool" , "Woodworking tool" , "What imitates bird" , "Tool for smoothing wood" , "Woodworker's tool" .)