Topless coupling on the radio! (6)
I believe the answer is:
airing
'the radio' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe there's an association between them I don't understand?
'topless coupling' is the wordplay.
'topless' means to remove the first letter.
'coupling' becomes 'pairing' ('pair' can be a synonym of 'couple').
'pairing' with its first letter removed is 'AIRING'.
'on' is the link.
Can you help me to learn more?
(Other definitions for airing that I've seen before include "excursion" , "Ventilating, say a grievance" , "Broadcast" , "Expressing (a grievance) publicly" , "Publicity" .)