Crossword Genius

In the Old Testament, the only child of Abraham and Sarah (5)

Ross

I believe the answer is:

isaac

(Other definitions for isaac that I've seen before include "one in Genesis" , "-- Asimov, sci-fi author" , "boy almost meeting early death" , "designated victim" , "Father to Jacob and Esau" .)

I've seen this clue in The Independent.
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