Crossword Genius

Russian autocrat's not left mark (5)

Ross

I believe the answer is:

stain

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'mark' is the definition.
(I know that mark can be written as stain)

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

Can you help me to learn more?

(Other definitions for stain that I've seen before include "Unsightly mark" , "Tarnish" , "Stigma" , "Satin (anag.)" , "Mark with colour, dirt" .)

I've seen this clue in The Sun.
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