Crossword Genius

Having lost belly, able to drink a stout (3)

Ross

I believe the answer is:

fat

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'stout' is the definition.
(similar in meaning)

I can't explain the rest of the clue.

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(Other definitions for fat that I've seen before include "eg Lard" , "Excess body weight" , "Corpulent; little (chance)" , "Adipose tissue" , "As Bunter" .)

I've seen this clue in The Times and The Sunday Times.
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