Loud party in joint, with drink (5-2)
I believe the answer is:
knees-up
'loud party' is the definition.
(a knees-up is a lively party)
'in joint with drink' is the wordplay.
'in joint' becomes 'knee' (knee joint is a kind of joint. I am not sure about the 'in' bit.).
'with' says to put letters next to each other.
'drink' becomes 'sup' (to sup is to drink).
'knee'+'sup'='KNEES-UP'
Can you help me to learn more?
(Other definitions for knees-up that I've seen before include "Dance with Mother Brown" , "Lively party (colloq.)" , "Riotous dance - party" , "Lively informal party" , "Informal party with dancing" .)