Character in the 1974 film Young Frankenstein played by Marty Feldman (4)

I believe the answer is:

igor

(Other definitions for igor that I've seen before include "Prince of Russian opera" , "Prince --, opera by Borodin" , "Prince in Borodin's opera" , "Prince of grand opera" , "Stravinsky, for example" .)

I've seen this clue in The Independent.

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