Crossword Genius

Gathering in? (5,5)

Ross

I believe the answer is:

house party

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This clue could be a double definition.

'gathering' is the first definition.
(house party is a kind of gathering)

'in?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

Can you help me to learn more?

(Another definition for house party that I've seen is " Group of guests staying a few days".)

I've seen this clue in The Telegraph.
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