The most common and most likely answer to this crossword clue is the 9 letter word DICTATORS
I've seen this crossword clue in The Guardian
D
I
C
T
A
T
O
R
S
Buddy explains!

The straight part
We know that "autocrats" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case autocrats = dictators.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.
What does DICTATORS mean?
DICTATORS noun- A totalitarian leader of a country, nation, or government.
- A magistrate without colleague in republican Ancient Rome, who held full executive authority for a term granted by the senate (legislature), typically to conduct a war.
- A tyrannical boss or authority figure.
- A person who dictates text (e.g. letters to a clerk).