Currently broadcasting (2,3)
I believe the answer is:
on air
'currently broadcasting' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for on air that I've seen before include "Broadcasting studio sign" , "If you're really happy, you'll float here" , "very happily?" , "In the process of broadcasting on radio or TV" , "Cushioned" .)