Spruce, smart (6)
I believe the answer is:
dapper
This clue is a double definition.
'spruce' is the first definition.
(I know that spruce can be written as dapper)
'smart' is the second definition.
(I've seen this in another clue)
(Other definitions for dapper that I've seen before include "Rakish" , "Neat and smart in appearance" , "Neat and well dressed" , "Spruce in bearing" , "Quick" .)