Having a pervading tone or mood (11)
I believe the answer is:
atmospheric
'having a pervading tone or mood' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for atmospheric that I've seen before include "Relating to earth's air" , "Having a pervading feeling" , "Evoking feelings or emotions" , "conveying a certain air" , "Relating to gaseous zone" .)