Some power half taken from leader of revolt (4)

I believe the answer is:

watt

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'some power' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for watt that I've seen before include "SI unit of power" , "man of power?" , "Work rate" , "Unit of power - Scottish inventor" , "Light bulb unit" .)

I've seen this clue in The Telegraph.

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