Insolent language, lip (8)

I believe the answer is:

backchat

(Other definitions for backchat that I've seen before include "Repartee" , "Impudent talk" , "cheeky retorts" , "Impertinent rejoinder" , "Impudent remarks" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.