LA gang member this evening reported threat to hero (10)
I believe the answer is:
kryptonite
'la gang member this evening reported threat' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'to hero' is the wordplay.
I cannot quite see how this works, but
'to' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for kryptonite that I've seen before include "Mineral avoided by Superman" , "threat to Kent" .)