Where emperor was confined in hotel bar (4)
I believe the answer is:
elba
'where emperor was confined' is the definition.
(I've seen this before)
'in hotel bar' is the wordplay.
'in' says the answer is hidden in the clue.
'ELBA' is hidden within 'hotel bar'.
(Other definitions for elba that I've seen before include "Napoleon exile island" , "Napoleonic island" , "Napoleon's prison isle" , "place for Napoleon" , "Where emperor was confined" .)