Havana is its capital (4)
I believe the answer is:
cuba
'havana is its capital' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cuba that I've seen before include "Largest West Indies island" , "Caribbean country of cigars and rum?" , "Fidel's place" , "Caribbean island republic" , "Country famous for its cigars" .)