Left before decision, creating divided opinion (5)
I believe the answer is:
split
I believe this clue is a triple definition!
'left' is the first definition.
(I've seen this before)
'before decision' is the second definition.
(as in a split decision)
'creating' acts as a link.
'divided opinion' is the third definition.
(as in splitting opinion)
(Other definitions for split that I've seen before include "Divorce - Adriatic city" , "share out" , "Croatian resort; rend" , "Croatian destination" , "Sliced < peach" .)