Thandiwe __, actor who played DCI Roz Huntley in Line of Duty (6)

I believe the answer is:

newton

(Other definitions for newton that I've seen before include "Scientist formulating laws of motion" , "He discovered the law of gravity" , "Unit of force - English polymath, d. 1727" , "Sir Isaac, discoverer of gravity" , "Gravity theorist" .)

I've seen this clue in The Guardian.

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