Green, naturally (5)
I believe the answer is:
leafy
'green' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for leafy that I've seen before include "Epithet applied to suburbs" , "resembling a glade?" , "more shady places?" , "Abounding with trees" , "Like nice suburbs" .)