Revel noisily (7)
I believe the answer is:
roister
'revel noisily' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for roister that I've seen before include "riot" , "Revel noisily, swagger" , "bluster" , "Rioters (anag.)" , "Noisy reveller" .)