Boris __, Russian president 1991-1999 (7)

I believe the answer is:

yeltsin

(Other definitions for yeltsin that I've seen before include "Nineteen ninety's Russian president" , "Russian statesman" , "Borris ......., former President of Russia" , "Russian president, d. 2007" , "Russian leader" .)

I've seen this clue in The Guardian.

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