Where Napoleon was solo (4)
I believe the answer is:
elba
'where napoleon was solo' 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 "Napoleon's first place of exile" , "Where emperor was confined" , "Napoleon exile island" , "Island of Napoleon's first exile" , "Napoleon's plaint: 'Able was I ere I saw . . . .'" .)