Crossword Genius

Round of drinking quietly stems short row, helping to cool one down? (8)

Ross

I believe the answer is:

scoopful

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'round' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

I can't explain the remainder of the clue.

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(Another definition for scoopful that I've seen is " helping".)

I've seen this clue in The Times.
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