One broadcasting is walking here with delight? (2,3)
I believe the answer is:
on air
I believe this is a double definition.
'one broadcasting' is the first definition.
(broadcasting on the air)
'walking here with delight?' is the second definition.
(as in walking on air)
'is' acts as a link.
(Other definitions for on air that I've seen before include "put out" , "Walk in delight here" , "Radio show might be" , "In the process of broadcasting - floating aloft?" , "Broadcasting at this moment" .)