SI unit of power (4)

I believe the answer is:

watt

'si unit of power' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for watt that I've seen before include "James -; Sc. engineer" , "Engineer, coined the term horsepower, d. 1819" , "James - - (Scottish inventor)" , "Unit of electric power" , "Unit of power - Scottish inventor" .)

I've seen this clue in The Mirror, The Telegraph and The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.