Eldest son of Cain
I believe the answer is:
enoch
'eldest son of cain' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for enoch that I've seen before include "Son of murderer" , "Biblical character" , "Cain's eldest son - Methuselah's father" , "Old Testament figure" , "Man in Bible" .)