Met green conditions coming out (8)
I believe the answer is:
emergent
'coming out' is the definition.
(emergent can mean emerging or coming out)
'met green conditions' is the wordplay.
'conditions' indicates an anagram (letters must be in a new condition).
'met'+'green'='metgreen'
'metgreen' is an anagram of 'EMERGENT'.
(Other definitions for emergent that I've seen before include "making an appearance" , "Greet men (anag) - developing" , "Coming into existence" , "achieving prominence" , "coming into view" .)