Atmosphere of an environment (8)
I believe the answer is:
ambience
'atmosphere of an environment' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ambience that I've seen before include "Atmosphere of manic bee" , "Place's atmosphere" , "Suitable surroundings for manic bee" , "Mood of place" , "Environment, surroundings" .)