Show tune (3)

I believe the answer is:

air

I believe this clue is a double definition.

'show' is the first definition.
(both can mean broadcast)

'tune' is the second definition.
('air' can be a synonym of 'tune')

(Other definitions for air that I've seen before include "Short song" , "Mixture of gases required for breathing" , "Broadcast; express" , "Substance breathed in" , "distinctive quality" .)

I've seen this clue in The Times.

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