Crossword Genius

The "in" type of party to have? (2-4)

Ross

I believe the answer is:

at-home

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But I can't explain it at all! Could you help me understand?

(Other definitions for at-home that I've seen before include "Where one lives" , "Domestic gathering" , "Not away - available to visitors" , "Oh mate! (anag)" , "Reception at residence" .)

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