Exile isle (4)
I believe the answer is:
elba
'exile isle' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for elba that I've seen before include "''Able was I ere I saw . . . .'' (4)" , "Island off Italy" , "place for Napoleon" , "Island where Napoleon was exiled" , "Napoleon's exile isle" .)