The most common and most likely answer to this crossword clue is the 11 letter word DELINQUENTS
I've seen this crossword clue in The Guardian
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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.
Crossword Answer definitions
DELINQUENTS noun- One who disobeys or breaks rules or laws.
- A person who has not paid his or her debts.
- A term applied to royalists by their opponents in the English Civil War 1642-1645. Charles I was known as the chief delinquent.