The most common and most likely answer to this crossword clue is the 11 letter word OSTRACISING
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result OSTRACISING
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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 OSTRACISING mean?
OSTRACISING verb- To ban a person from a city for five or ten years through the procedure of ostracism.
- (by extension) To exclude a person from a community or from society by not communicating with them or by refusing to acknowledge their presence; to refuse to associate with or talk to; to shun.