Start early -- bound to go before hunt, e.g., set out (4,3,3)
I believe the answer is:
jump the gun
'start early' is the definition.
(to jump the gun is to begin something too soon)
'bound to go before hunt e g set out' is the wordplay.
'bound' becomes 'jump' (I've seen this in another clue).
'to go before' is a charade indicator (letters next to each other).
'set out' is an anagram indicator.
'hunt'+'e'+'g'='hunteg'
'hunteg' is an anagram of 'thegun'.
'jump'+'thegun'='JUMP THE GUN'
(Other definitions for jump the gun that I've seen before include "Be too hasty" , "Leave too early" , "Start too quickly" , "Come too early out of the starting blocks?" , "Act prematurely" .)