Jim —, Scottish fighter; WBC Lightweight champion from 1979-81 (4)

I believe the answer is:

watt

(Other definitions for watt that I've seen before include "Unit of power -- Scottish engineer, d. 1819" , "Work rate" , "Unit of power - Scottish inventor" , "Man of note" , "bit of power" .)

I've seen this clue in The Mirror.

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