You'll get such talk at the bar! (8)
I believe the answer is:
legalese
'bar' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps there's a link between them I don't understand?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for legalese that I've seen before include "Solicitor's jargon" , "Special terms" , "barman's peculiar words" , "it's hard for most to understand" , "Bar talk" .)