The most common and most likely answer to this crossword clue is the 9 plus 1 letter word VENDETTA} –
I've seen this crossword clue in The Daily Telegraph
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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.
What does VENDETTA} – mean?
VENDETTA} – noun- A bitter, destructive feud, normally between two families, clans or factions, in which each injury or slaying is revenged: a blood feud.
- (often preceded by personal) A motivational grudge against a person or faction, which may or may not be reciprocated; the state of having it in for someone.