Neat tree (6)
I believe the answer is:
spruce
This clue is a double definition.
'neat' is the first definition.
(synonyms)
'tree' is the second definition.
(spruce is a kind of tree)
(Other definitions for spruce that I've seen before include "Coniferous tree" , "Evergreen pyramid-shaped tree" , "wood" , "Smart and tidy - tree" , "Well-dressed" .)