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Large crowd welcoming back returning group (7)

Ross

I believe the answer is:

madness

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This clue could be a double definition.

'large crowd' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'welcoming back returning group' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

Can you help me to learn more?

(Other definitions for madness that I've seen before include "Absurdity" , "Folly" , "hysteria?" , "Dementia" , "fury" .)

I've seen this clue in The Telegraph.
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