Unit of power (4)

I believe the answer is:

watt

'unit of power' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for watt that I've seen before include "Scottish engineer and inventor, d. 1819" , "SI unit of power" , "Unit of electricity" , "man of power?" , "Worker in steam" .)

I've seen this clue in the Sydney Morning Herald, The Independent, The Sun, the Penny Press, the Universal, The Irish Times, The Times, The Telegraph and The Guardian.

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