The most common and most likely answer to this crossword clue is the 10 letter word MISPRISION
I've seen this crossword clue in The Daily Telegraph
M
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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 MISPRISION mean?
MISPRISION noun- Criminal neglect of duty or wrongful execution of official duties.
- The failure to give information about a crime that one knows to be taking place.
- Misinterpretation or misunderstanding.