Biblical twin (4)
I believe the answer is:
esau
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">biblical twin</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 esau that I've seen before include "Biblical brother to Jacob" , "Jacob's brother in the bible" , "Son of Isaac and Rebecca" , "Isaac's hairy son" , "Hairy OT man" .)