Crossword Genius

Survive without food, broad­casting in real time (4,2,3)

Ross

I believe the answer is:

live on air

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'real time' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'survive without food broadcasting in' is the wordplay.
'survive' becomes 'live' (synonyms).
'without food' becomes 'air' (I can't explain this - if you can you should give a lot more credence to this answer).
'broadcasting' becomes 'on'.
'in' indicates putting letters inside.
'live'+'air'='liveair'
'liveair' going around 'on' is 'LIVE ON AIR'.

Can you help me to learn more?

(Other definitions for live on air that I've seen before include "Survive without eating" , "Never apparently eat" , "not recorded" .)

I've seen this clue in The Guardian.
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