Biblical brother of Jacob (4)
I believe the answer is:
esau
'biblical brother of jacob' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for esau that I've seen before include "Jacob's brother in the bible" , "Biblical man who sold his birthright for a mess of pottage" , "Twin brother of Jacob" , "Biblical character sounds as if he had a vision" , "wronged brother" .)