Crossword Genius

Couples in bar neck chianti – what impertinence! (8)

Ross

I believe the answer is:

backchat

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'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" .)

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