Enviro-friendly (5)
I believe the answer is:
green
'enviro-friendly' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for green that I've seen before include "Envious -- environmentalist" , "It's for putting on - colour - inexperienced" , "Verdant; naive" , "Ecologically correct" , "bowlers here?" .)