Scientist Isaac (6)

I believe the answer is:

newton

(Other definitions for newton that I've seen before include "Famous scientist" , "inclined to apply discovery?" , "Formulator of the law of gravitation, d. 1727" , "'English physicist, described the law of gravity (6)'" , "Great English mathematician who discovered gravity" .)

I've seen this clue in The Sun and the King Feature Syndicate.

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