Austria's capital (6)
I believe the answer is:
vienna
'austria's capital' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for vienna that I've seen before include "Capital city of Austria" , "Austrian city of the waltz" , "European capital" , "huge 20 [ULTRAVOX] hit" , "Adult home of Beethoven, Brahms, Mozart and Schubert" .)