A Godunov character in Russian opera (5)

I believe the answer is:

boris

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'a godunov' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

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

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