Jacob's twin (4)
I believe the answer is:
esau
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">jacob's twin</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for esau that I've seen before include "wronged brother" , "scriptural character" , "Biblical character who sold birthright for pottage" , "He traded his birthright for a mess of pottage" , "brother done in Bible" .)