Crossword Genius

Lively party in joint associated with drink (5-2)

Ross

I believe the answer is:

knees-up

'lively party' is the definition.
(I've seen this before)

'joint associated with drink' is the subsidiary indication.
'joint' becomes 'knee' (knee is a kind of joint).
'associated with' says to put letters next to each other.
'drink' becomes 'sup' (I've seen this before**).
'knee'+'sup'='kneesup'

'in' is the link.

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

I've seen this clue in The Telegraph.
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