The most common and most likely answer to this crossword clue is the 15 letter word EXCOMMUNICATION
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Buddy explains!
The straight part
We know that "you are sent out of the church" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case you are sent out of the church = excommunication.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 EXCOMMUNICATION mean?
EXCOMMUNICATION noun- The act of excommunicating, disfellowshipping or ejecting; especially an ecclesiastical censure whereby the person against whom it is pronounced is, for the time, cast out of the communication of the church; exclusion from fellowship in things spiritual.