What Barnet may mean to a cockney (3)
I believe the answer is:
air
'cockney' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for air that I've seen before include "Cause of inflation" , "Region above the ground" , "Sky" , "Skye Boat Song, perhaps" , "Atmosphere, manner" .)