Is it stout in drinks bought for the group? (5)

I believe the answer is:

round

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'group?' is the definition.
Both the answer and definition are adjectives. Maybe you can see an association between them that I can't see?

I cannot understand how the remainder of the clue works.

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(Other definitions for round that I've seen before include "single slice of bread!" , "18 holes of golf" , "Approximate" , "Set of drinks - set of holes" , "purchase of drinks" .)

I've seen this clue in The Sun and The Telegraph.

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