Kirk's foe whose name Kirk famously shouted in a 1982 film (4)

I believe the answer is:

khan

(Other definitions for khan that I've seen before include "Title taken by ancient Mongol emperors, such as Genghis" , "Title of respect in central Asia (for a descendant of Genghis?)" , "Imran --, Pakistan's PM" , "Eastern emperor" , "A Genghis successor?" .)

I've seen this clue in The Washington Post.

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