European country, capital Vienna (7)
I believe the answer is:
austria
This clue is a double definition.
'european country' is the first definition.
(country in Europe)
'capital vienna' is the second definition.
(I know that Austria has the capital city Vienna)
(Other definitions for austria that I've seen before include "Its ruling house was the Hapsburgs" , "Republic of central Europe" , "land in Europe" , "Find US tiara in this country" , "The Von Trapps lived there" .)