In class, one gathered? (7)

I believe the answer is:

grouped

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This clue might be a double definition.

'in class one' is the first definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?

'gathered?' is the second definition.
(grouping is a kind of gathering)

Can you help me to learn more?

(Another definition for grouped that I've seen is " Clustered".)

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