Trim conifer (6)
I believe the answer is:
spruce
I believe this is a double definition.
'trim' is the first definition.
(synonyms)
'conifer' is the second definition.
(I know that spruce is a type of conifer)
(Other definitions for spruce that I've seen before include "Well-groomed - tree" , "Elegant" , "wood" , "Tidy - fir" , "Evergreen pyramid-shaped trees" .)