Well-groomed tree (6)
I believe the answer is:
spruce
I believe this is a double definition.
'well-groomed' is the first definition.
('spruce' can be a synonym of 'well-groomed')
'tree' is the second definition.
(spruce is a kind of tree)
(Other definitions for spruce that I've seen before include "Neat - evergreen" , "Christmas tree, perhaps" , "ornamental tree" , "Well-dressed" , "Smart in appearance like fir tree" .)