Crossword Genius

Moan about drink, say (5)

Ross

I believe the answer is:

whine

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'moan' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for whine that I've seen before include "Grumble" , "Moan" , "Nagging complaint" , "Complaining cry" , "Gripe" .)

I've seen this clue in The Mirror.
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