Son of Isaac (4)

I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">son of isaac</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that Esau father Isaac)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for esau that I've seen before include "Jacob's brother (OT)" , "Birthright seller (Bible)" , "First son of Isaac (Bible)" , "Rebecca's son" , "Biblical character sounds as if he had a vision" .)