Smooth-barked tree (5)
I believe the answer is:
beech
'smooth-barked tree' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for beech that I've seen before include "It has branches" , "Common forest tree" , "Timber tree" , "Copper or silver tree" , "Tree of Fagus genus" .)