Alternating current proponent (5)

I believe the answer is:

tesla

'alternating current proponent' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for tesla that I've seen before include "Nikola ---, electricity pioneer" , "Physics unit" , "Physicist" , "SI unit; steal (anag.)" , "American scientist" .)

I've seen this clue in The Wall Street Journal.

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