Son of Cain (5)
I believe the answer is:
enoch
'son of cain' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for enoch that I've seen before include "-- Powell, former politician" , "OT patriarch" , "Son of murderer" , "Father of Methuselah" , "Eldest son of Cain - the late Mr Powell" .)