An air of resignation? (3,4,4)

I believe the answer is:

que sera sera

I believe this clue is a double definition.

'an air' is the first definition.
(a song or 'air')

'resignation?' is the second definition.
(resigned phrase 'what will be will be' in French)

'of' is the link.

(Another definition for que sera sera that I've seen is " What will be, will be".)

I've seen this clue in The Times.

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