Crossword Genius

Leading Russian trembles after going to extremes (4)

Ross

I believe the answer is:

tsar

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'leading russian' is the definition.

I can't explain the rest of the clue.

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(Other definitions for tsar that I've seen before include "Tyrant" , "specific authority" , "Rats (anag)" , "Old Russian ruler" , "Person in charge" .)

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