TV studio light

I think it could be either:

Which length description are you looking for?:

2,3

on air

'tv studio light' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for on air that I've seen before include "In the process of broadcasting - floating aloft?" , "Transmitting now!" , "Live broadcast" , "In the act of broadcasting" , "put out" .)

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