A shade naive (5)
I believe the answer is:
green
This clue is a double definition.
'a shade' is the first definition.
(I know that green is a type of chromatic color)
'naive' is the second definition.
(I know that naive can be written as green)
(Other definitions for green that I've seen before include "Ecologically sound" , "Murderer" , "Environment-friendly" , "Grassy enclosure, in a village say" , "like 29 [MARTIAN] , stereotypically" .)