Crossword Genius

Joseph's grandfather (5)

Ross

I believe the answer is:

isaac

'joseph's grandfather' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for isaac that I've seen before include "Abraham's son" , "Put away" , "Newton's first name" , "Son of Abraham, offered as a sacrifice to God" , "designated victim" .)

I've seen this clue in the Newsday.com and the Newsday.
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