Austrian capital (6)
I believe the answer is:
vienna
'austrian capital' is the definition.
(capital of Austria)
This is the entire clue.
(Other definitions for vienna that I've seen before include "Capital city of Austria" , "Adult home of Beethoven, Brahms, Mozart and Schubert" , "Capital on the Danube Canal" , "City of Strauss and the waltz" , "somewhere in Austria" .)