Biblical character appearing in different accounts (5)

I believe the answer is:

isaac

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'biblical character' is the definition.
(Old Testament figure)

I cannot understand how the remainder of the clue works.

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

I've seen this clue in The Times.

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