Boozy group return to hold a wild party (4)
I believe the answer is:
orgy
'a wild party' is the definition.
(orgy can mean a boisterous party)
'boozy group return to hold' is the wordplay.
'to hold' indicates a hidden word (I've seen 'holds' mean this).
'return' shows that the letters should be reversed in order.
'ygro' is hidden in the letters of 'boozy group'.
'ygro' back-to-front is 'ORGY'.
(Other definitions for orgy that I've seen before include "Unrestrained revel" , "Drunken revel" , "Wild overindulgent party" , "Bacchanal" , "Wild revelry" .)