That somewhat rigorous Russian! (4)

I believe the answer is:

igor

'russian' is the definition.
(I've seen this before)

'that somewhat rigorous' is the wordplay.
'that somewhat' says the answer is hidden in the clue.
'IGOR' is hidden within '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" .)

I've seen this clue in the Evening Standard.

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