The most common and most likely answer to this crossword clue is the 11 letter word DEPORTATION
I've seen this crossword clue in The Daily Telegraph
D
E
P
O
R
T
A
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N
Buddy explains!
The straight part
We know that "exile" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case exile = deportation.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 DEPORTATION mean?
DEPORTATION noun- The act of deporting or exiling, or the state of being deported; banishment; transportation.