Crossword Genius

500 out taking drinks to party? It must have enough ice to go round (7,4)

Ross

I believe the answer is:

skating rink

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'round' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand the remainder of the clue.

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