Capital of Austria (6)
I believe the answer is:
vienna
'capital of austria' is the definition.
(synonyms)
This is all the clue.
(Other definitions for vienna that I've seen before include "Capital city on the Danube" , "Strauss 'Tales from the . . . . . . Woods'" , "On the Danube, it was home to many great composers" , "somewhere in Austria" , "City of Strauss and the waltz" .)