Old Testament twin (4)
I believe the answer is:
esau
'old testament twin' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for esau that I've seen before include "Twin brother of Jacob" , "Jacob's brother in the bible" , "Biblical man who sold his birthright for a mess of pottage" , "scriptural character" , "Elder of the twin sons of Isaac and Rebecca" .)