Atmosphere detected in restaurant (4)

I believe the answer is:

aura

I'm a little stuck... Click here to teach me more about this clue!

'atmosphere' is the definition.
(synonyms)

'restaurant' is the wordplay.
'AURA' is hidden within the letters.
However, I am not sure how this is indicated.

'detected in' acts as a link.

Can you help me to learn more?

(Other definitions for aura that I've seen before include "Halo" , "Intangible atmosphere" , "Particular ambience" , "Atmosphere [ital]" , "Nimbus" .)

I've seen this clue in The Times.

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