Crossword Genius

Rum set in special, large 1L stout bottles... that is lapped up by customers (10)

Ross

I believe the answer is:

bestseller

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But I can't explain it at all! Could you help me understand?

(Other definitions for bestseller that I've seen before include "top author" , "Dickens for instance" .)

I've seen this clue in The Hindu.
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