Country in Asia I'd nit-picked over (5)
I believe the answer is:
india
'country' is the definition.
(I know that India is a country)
'in asia i'd nit-picked over' is the wordplay.
'in' indicates a hidden word.
'over' says the letters should be written backwards.
'aidni' is hidden in the letters of 'asia id nit picked'.
'aidni' reversed gives 'INDIA'.
(Other definitions for india that I've seen before include "Country in South Asia" , "A Passage to - (E.M. Forster)" , "Gandhi's country" , "Bollywood's country" , "One preceding Juliet" .)