Broadcasting (2,3,3)
'broadcasting' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for on the air that I've seen before include "In the process of broadcasting, radio or TV" , "Broadcasting (hence audible)" , "Anti-hero engaged in live broadcast" , "radio listeners can now hear?" .)
'broadcasting' is the definition.
(broadcasting on the air)
This is the entire clue.
(Other definitions for on air that I've seen before include "Cushioned" , "Walk in delight here" , "Currently broadcasting" , "Broadcasting at this moment" , "In the process of broadcasting on radio or TV" .)
'broadcasting' is the definition.
(as in airing a TV programme)
This is all the clue.
(Other definitions for airing that I've seen before include "Exposure" , "Expressing (an opinion) publicly" , "Ventilating, say a grievance" , "Broadcasting" , "Ventilation" .)