Can recall Napoleon's exile (4)

I believe the answer is:

elba

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'napoleon's exile' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

(Other definitions for elba that I've seen before include "Island of Napoleon's exile in 1814-15" , "Napoleon's prison isle" , "Where emperor was confined" , "Napoleonic prison" , "Napoleon prison isle" .)

I've seen this clue in The Globe and Mail.

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