Cite green revolution for active (9)
I believe the answer is:
energetic
'active' is the definition.
(associated in meaning)
'cite green revolution' is the wordplay.
'revolution' indicates an anagram.
'cite'+'green'='citegreen'
'citegreen' with letters rearranged gives 'ENERGETIC'.
'for' is the link.
(Other definitions for energetic that I've seen before include "Showing great activity" , "Full of beans" , "Brisk" , "It's vital" , "Involving great activity" .)