Put off explosive device with resolve (9)
I believe the answer is:
determine
'resolve' is the definition.
(I know that resolve is a more specific form of the action determine)
'put off explosive device' is the wordplay.
'put off' becomes 'deter' (both can mean to discourage).
'explosive device' becomes 'mine' (mine is a kind of explosive device).
'deter'+'mine'='DETERMINE'
'with' is the link.
(Other definitions for determine that I've seen before include "Come to a decision" , "Establish" , "Decide - to settle" , "Dictate" , "I'm entered, so find our precisely" .)