Drunken revel leads to a gory mess (4)
I believe the answer is:
orgy
'drunken revel' is the definition.
(I've seen this before)
'a gory mess' is the wordplay.
'mess' indicates anagramming the letters.
'gory' is an anagram of 'ORGY'.
'leads to' acts as a link.
(Other definitions for orgy that I've seen before include "overindulgence" , "Bacchanalian party" , "Wild self-indulgent party" , "wild spree" , "Wild overindulgent party" .)