Crossword Genius

Retort about lumbago? (8)

Ross

I believe the answer is:

backchat

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'retort' is the first definition.
(I have seen 'Impudent retort' mean 'backchat' so perhaps 'retort' could also mean 'backchat')

'lumbago?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'about' acts as a link.

Can you help me to learn more?

(Other definitions for backchat that I've seen before include "Effrontery" , "cheeky retorts" , "Cheeky words in response to rebuke" , "Impudent talk" , "Impudent rejoinder" .)

I've seen this clue in The Globe and Mail.
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