James —, Scottish engineer and inventor who improved the steam engine (4)

I believe the answer is:

watt

(Other definitions for watt that I've seen before include "Work rate" , "Unit of electric power" , "man of power?" , "Engineer, coined the term horsepower, d. 1819" , "Scot. engineer; unit of power" .)

I've seen this clue in The Mirror.

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