A shade naive (5)

I believe the answer is:

green

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This might be a double definition.

'a shade' is the first definition.
The definition and answer can be both human attributes as well as being singular nouns.
Maybe there's an association between them I don't understand?

'naive' is the second definition.
(similar in meaning)

Can you help me to learn more?

(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" .)

I've seen this clue in The Mirror.

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