Crossword Genius

Biblical patriarch's two separate accounts (5)

Ross

I believe the answer is:

isaac

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'biblical patriarch's' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for isaac that I've seen before include "boy almost meeting early death" , "Esau's father" , "According to the book, twins' dad" , "-- Asimov, sci-fi author" , "Hebrew patriarch" .)

I've seen this clue in The Telegraph.
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