Crossword Genius

Large noisy party (informal) (5-2)

Ross

I believe the answer is:

knees-up

(Other definitions for knees-up that I've seen before include "Informal party with dancing" , "Riotous dance - party" , "Lively informal party" , "Dance with Mother Brown" , "Lively party (colloq.)" .)

I've seen this clue in The Guardian.
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