The most common and most likely answer to this crossword clue is the 7 letter word TSARIST
I've seen this crossword clue in The Times
T
S
A
R
I
S
T
More clues leading to the result TSARIST
- Asserts aristocrat is sheltering enemy of the revolution?
- Old Russian in dire straits
- Adherent of emperor in dire straits
- Supporter of dictator hiding dresses in vacant toilet
- Garments adopted by dry emperor’s champion
- Dire Straits official supporter
- Old Russian man blocking suggestion mostly rejected
- Like Russia once — in dire straits
- One supporting ruler‘s flowing garments in case of torrent
- Follower of ruler seen in Asian garments time after time
Buddy explains!

The straight part
We know that "enemy of the revolution" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case enemy of the revolution = tsarist.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.