Atmosphere in restaurant (4)
I believe the answer is:
aura
'atmosphere' is the definition.
(synonyms)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for aura that I've seen before include "Glorious glow" , "Perception of distinctive personality" , "Distinctive character, essence of a living thing" , "Mystic air" , "Vibe" .)