Carouse, roister (5)
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I believe the answer is:
revel
I believe this is a double definition.
'carouse' is the first definition.
(I've seen this in another clue)
'roister' is the second definition.
(I've seen this in another clue)
(Other definitions for revel that I've seen before include "Make merry, whoop it up" , "Make merry; luxuriate (in)" , "Make merry, have a ball" , "party" , "Merrymaking" .)