Elegant young socialite leaves broadcasting (2-3)

I believe the answer is:

on-air

'broadcasting' is the definition.
(broadcasting on the air)

'elegant young socialite leaves' is the wordplay.
'elegant' becomes 'debonair' (I've seen this before).
'young socialite' becomes 'deb' (debutante).
'leaves' is a deletion indicator.
'debonair' with 'deb' taken out is 'ON-AIR'.

I've seen this clue in The Independent.

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