Antagonist of Rocky and Bullwinkle (5)

I believe the answer is:

boris

(Other definitions for boris that I've seen before include "Russian name" , "-- Godunov; -- Johnson" , "- Godunov, Mussorgsky opera" , "Leading Brexiteer's given name" , "Pasternak, perhaps" .)

I've seen this clue in the LA Times.

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