Girl at first missing atmosphere (4)

I believe the answer is:

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This clue could be a double definition.

'girl' is the first definition.

'first missing atmosphere' is the second definition.
'aura' can be an answer for 'atmosphere' (synonyms). I am not sure about the 'first missing' bit.

'at' is the link.

Can you help me to learn more?

(Other definitions for aura that I've seen before include "Supposed emanation surrounding the body" , "Peculiar sensations" , "Distinctive quality (of something or someone)" , "Atmosphere or glow surrounding a person" , "Perception of distinctive personality" .)

I've seen this clue in The Sun.

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