Crossword Genius

Prolific writer Asimov (5)

Ross

I believe the answer is:

isaac

'prolific writer asimov' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for isaac that I've seen before include "Singer" , "Jewish name?" , "designated victim" , "- Newton, Eng. physicist and mathematician" , "OT near-sacrificial victim" .)

I've seen this clue in the Universal and The Wall Street Journal.
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