Crossword Genius

Sir __ Newton (5)

Ross

I believe the answer is:

'sir newton' 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 "Hebrew patriarch" , "boy almost meeting early death" , "Jewish name?" , "Newton's first name" , "Sir -- Newton, English scientist" .)

I've seen this clue in The Mirror and the Newsday.
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