Merrymaker (8)
I believe the answer is:
reveller
'merrymaker' is the definition.
(I know that merrymaker can be written as reveller)
This is all the clue.
(Other definitions for reveller that I've seen before include "Noisy celebrator" , "Riotous merrymaker" , "One who carouses or parties" , "A carouser, out on the town" , "Party girl" .)