Broadcasting acceptable song (2-3)

I believe the answer is:

on-air

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

'acceptable song' is the wordplay.
'acceptable' becomes 'on' (as opposed to not on, unacceptable).
'song' becomes 'air' (air can mean a piece of music).
'on'+'air'='ON-AIR'

I've seen this clue in The Independent.

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