Leafy vegetables (6)
I believe the answer is:
greens
'leafy vegetables' is the definition.
('green' can be a synonym of 'leafy vegetable')
This is the entire clue.
(Other definitions for greens that I've seen before include "Ecology party" , "identified by little flags" , "Putting areas" , "Signs people should go" , "Vegetables - on the golf course?" .)