The most common and most likely answer to this crossword clue is the 11 letter word PLEBISCITES
I've seen this crossword clue in The Daily Telegraph
P
L
E
B
I
S
C
I
T
E
S
More clues leading to the result PLEBISCITES
Buddy explains!

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 PLEBISCITES mean?
PLEBISCITES noun- A referendum, especially one that concerns changes in sovereignty