Crossword Genius

Charlie may pop back for a drink (6)

Ross

I believe the answer is:

cognac

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'for a drink' is the definition.
(Cognac is an example)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for cognac that I've seen before include "French brandy region" , "warmer" , "Type of brandy" , "High quality brandy" , "French town - French brandy" .)

I've seen this clue in The Independent.
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