The most common and most likely answer to this crossword clue is the 11 letter word PROSECUTION
I've seen this crossword clue in The Guardian
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More clues leading to the result PROSECUTION
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 PROSECUTION mean?
PROSECUTION noun- The act of prosecuting a scheme or endeavor.
- The institution of legal proceedings (particularly criminal) against a person.
- The prosecuting party.