Isle of exile (4)
I believe the answer is:
elba
'isle of exile' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for elba that I've seen before include "part of Tuscany?" , "Napoleon prison isle" , "Napoleon's exile isle" , "Island of Napoleon's exile in 1814-15" , "Where emperor was confined" .)