Put off by setter's resolve (9)
I believe the answer is:
determine
'resolve' is the definition.
(determining is a kind of resolving)
'put off by setter's' is the wordplay.
'put off' becomes 'deter' (I've seen this before).
'by' says to put letters next to each other.
'setter's' becomes 'mine'.
'deter'+'mine'='DETERMINE'
(Other definitions for determine that I've seen before include "fix" , "Decide - to settle" , "Learn" , "Dictate" , "Come to a decision" .)