That somewhat rigorous Russian! (4)

I believe the answer is:

igor

'russian' is the definition.
(common Russian name)

'that somewhat rigorous' is the wordplay.
'that somewhat' indicates a hidden word.
'IGOR' is hidden in the letters of 'rigorous'.

(Other definitions for igor that I've seen before include "-- Stravinsky, composer" , "Card game" , "Prince of Russian opera" , "Maybe 8 [SIKORSKY]" , "Prince of grand opera" .)

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