I'm often caped and hope ruse runs and runs within (9)
I believe the answer is:
superhero
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for superhero that I've seen before include "lifesaver?" , "Her poseur (anag.)" , "person who catches lots of baddies" , "Batman, say?" , "Eg, Batman; surer hope (anag.)" .)