The most common and most likely answer to this crossword clue is the 9 letter word PATROLLED
I've seen this crossword clue in The Daily Telegraph
P
A
T
R
O
L
L
E
D
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 PATROLLED mean?
PATROLLED verb- To go the rounds along a chain of sentinels; to traverse a police district or beat.
- To go the rounds of, as a sentry, guard, or policeman
- Having regular patrols.