Old war hero is a criminal among men (9)
I believe the answer is:
agamemnon
'old war hero' is the definition.
'agamemnon' can be an answer for 'hero' (I have seen 'Legendary hero' mean 'agamemnon' so perhaps 'hero' could also mean 'agamemnon'). I am unsure of the 'old war' bit.
'a criminal among men' is the wordplay.
'criminal' indicates anagramming the letters.
'among'+'men'='amongmen'
'amongmen' with letters rearranged gives 'gamemnon'.
'a'+'gamemnon'='AGAMEMNON'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for agamemnon that I've seen before include "Fabled king soon" , "Leader of Greeks against Troy" , "mythological king" , "Gk. leader against Troy" , "Greek king murdered by his wife Clytemnestra" .)