Crossword Genius

Isaac's firstborn (4)

Ross

I believe the answer is:

esau

'isaac's firstborn' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for esau that I've seen before include "Jacob's brother (OT)" , "wronged brother" , "Big Brother" , "Biblical man who sold his birthright for a mess of pottage" , "Elder of the twin sons of Isaac and Rebecca" .)

I've seen this clue in The New York Times and the Penny Press.
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