Insisting to give listener in-swing (8)
I believe the answer is:
swearing
'insisting' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'listener in-swing' is the wordplay.
'listener' becomes 'ear' (body part which hears or listens).
'in' means one lot of letters goes inside another.
'ear' placed within 'swing' is 'SWEARING'.
'to give' acts as a link.
Can you help me to learn more?
(Other definitions for swearing that I've seen before include "Affirming or cursing" , "blue emissions?" , "Foul language" , "Using bad language" , "promising" .)