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How the exultant stroll when broadcasting? (4,2,3)

Ross

I believe the answer is:

walk on air

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'how the exultant' is the definition.
I can't judge whether this definition defines the answer.

'stroll when broadcasting?' is the wordplay.
'stroll' becomes 'walk' (I've seen this before).
'when broadcasting?' becomes 'onair' (broadcasting on the air. I am not sure about the 'when' bit.).
'walk'+'onair'='WALK ON AIR'

Can you help me to learn more?

(Other definitions for walk on air that I've seen before include "Feel elated, stroll aloft" , "Feel elated - stroll in elevated manner" , "Feel delighted" , "Feel elated in ambulatory mode?" , "Feel elated - stroll as if floating" .)

I've seen this clue in the Sydney Morning Herald.
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