Third son of Adam (4)
I believe the answer is:
seth
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">third son of adam</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for seth that I've seen before include "Early man" , "Indian novelist, Vikram" , "Boy's name" , "One of the first names recorded" , "A Starkadder" .)