Exile site for Napoleon (4)
I believe the answer is:
elba
'exile site for napoleon' 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 "Island off Italy" , "Napoleonic island" , "Island in the Med" , "Napoleon's plaint: 'Able was I ere I saw . . . .'" , "''Able was I ere I saw . . . .'' (4)" .)