Bound to misfire as a ruse! (4)
I believe the answer is:
sure
'bound to' is the definition.
(synonyms)
'misfire as a ruse' is the wordplay.
'ruse' can be anagrammed to 'SURE'.
Though, I'm not sure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for sure that I've seen before include "The old sewer" , "of course" , "Confident sort of ruse" , "Certain to be a ruse" , "Agreed" .)