Couples in bar neck chianti – what impertinence! (8)
I believe the answer is:
backchat
'impertinence' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for backchat that I've seen before include "Impudent retort" , "Impudent talk" , "Insolence" , "Impertinent rejoinder" , "cheeky retorts" .)