Power unit (4)

I believe the answer is:

watt

'power unit' is the definition.
(unit of power)

This is all the clue.

(Other definitions for watt that I've seen before include "Unit of power - Scottish inventor" , "Unit of electric power" , "man of power?" , "Scot. engineer; unit of power" , "SI unit of power" .)

I've seen this clue in The Wall Street Journal, the Universal, the King Feature Syndicate, the Penny Press, The New York Times and the LA Times.

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