Offender, hell-bound even? (5)
I believe the answer is:
felon
'offender' is the definition.
(felon is a kind of offender)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for felon that I've seen before include "Convicted criminal" , "Serious criminal" , "Wrong-doer" , "Malefactor" , "criminal from Texas" .)