Calcutta's country (5)
I believe the answer is:
india
'calcutta's country' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for india that I've seen before include "Second most populous country in the world" , "One preceding Juliet" , "Major sub-continent of Asia" , "Commonwealth country, independent in 1947" , "I identified on radio" .)