The most common and most likely answer to this crossword clue is the 7 letter word YELTSIN
Y
E
L
T
S
I
N
More clues leading to the result YELTSIN
- Ex-president failing in style
- Russian leader travelling in style
- Old leader getting drunk in style
- Russian politician still to admit large crime
- Old Russian manoeuvred in style
- Former statesman, drunk in style?
- New style home – Russian
- Old leader isn’t half likely to be blotto
- Left embraced by even Vice President of Russia
- Ex-President still getting to slip having consumed last bit of alcohol?
Buddy explains!

The straight part
We know that "Old leader" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old leader = yeltsin.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.