Crossword Genius

Immature environmentalist (5)

Ross

I believe the answer is:

green

This clue is a double definition.

'immature' is the first definition.
(synonyms)

'environmentalist' is the second definition.
(member of the Green Party)

(Other definitions for green that I've seen before include "17's colour" , "Like lettuce" , "conservationist" , "Village space" , "The colour of immaturity" .)

I've seen this clue in The Telegraph.
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