Green plan for community (9)
I believe the answer is:
ecosystem
'for community' is the definition.
(I've seen this before)
'green plan' is the wordplay.
'green' becomes 'eco' (abbreviation for ecological).
'plan' becomes 'system' (system is a kind of plan).
'eco'+'system'='ECOSYSTEM'
(Other definitions for ecosystem that I've seen before include "Community of organisms and their environment" , "orderly collection of organisms" , "Biological community with its environment" , "The interaction of a group of organisms with their physical environment" , "integrated community" .)