The most common and most likely answer to this crossword clue is the 7 plus 6 letter word THOUGHT POLICE
I've seen this crossword clue in The Daily Telegraph
T
H
O
U
G
H
T
P
O
L
I
C
E
More clues leading to the result THOUGHT POLICE
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.