Start a wild binge (5)
I believe the answer is:
begin
'start' is the definition.
(I know that start can be written as begin)
'a wild binge' is the wordplay.
'a wild' is an anagram indicator.
'binge' is an anagram of 'BEGIN'.
(Other definitions for begin that I've seen before include "Make a start" , "Partly open" , "Commence" , "Clandestine, furtive" , "Israeli prime minister and Nobel Peace Prize winner, d. 1992" .)