Eldest son of Cain
I believe the answer is:
enoch
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">eldest son of cain</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(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" .)