Crossword Genius

--- Asimov, science-fiction author (1920-92) (5)

Ross

I believe the answer is:

isaac

(Other definitions for isaac that I've seen before include "According to the book, twins' dad" , "Son of Abraham, offered as a sacrifice to God" , "Jewish name?" , "designated victim" , "Actor Oscar" .)

I've seen this clue in The Times.
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