Crossword Genius

Not much of a drink (3)

Ross

I believe the answer is:

sip

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'a drink' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for sip that I've seen before include "Small mouthful of fluid" , "Take small mouthfuls of (drink)" , "Thimbleful" , "A small taste" , "Small mouthful of liquid" .)

I've seen this clue in the Evening Standard.
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