Candid atmosphere displayed outside? (4-3)
I believe the answer is:
open-air
'displayed outside?' is the definition.
(eg an open-air concert)
'candid atmosphere' is the wordplay.
'candid' becomes 'open' (I've seen this in another clue).
'atmosphere' becomes 'air' (synonyms).
'open'+'air'='OPEN-AIR'
(Other definitions for open-air that I've seen before include "Taking place outdoors" , "Exposed to the elements" , "outside" , "not below roof" , "Alfresco" .)