James Clerk —, scientist (7)

I believe the answer is:

maxwell

(Other definitions for maxwell that I've seen before include "Robert, once a press baron" , "Pioneer of electromagnetism - Czech-born tycoon" , "Czech-born British publisher, d. at sea 1991" , "James Clerk --, Scottish physicist" , "Scottish scientist" .)

I've seen this clue in The Times.

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