Smooth tree (5)

I believe the answer is:

plane

This clue is a double definition.

'smooth' is the first definition.
(plane can mean to smooth down)

'tree' is the second definition.
(plane is a type of tree)

(Other definitions for plane that I've seen before include "Smooth" , "Woodworker's tool" , "This flier" , "Woodworking tool" , "Form of transport" .)

I've seen this clue in The Telegraph.

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