Anne VI lost European capital (6)
I believe the answer is:
vienna
'european capital' is the definition.
(I've seen this before)
'anne vi lost' is the wordplay.
'lost' indicates an anagram.
'anne'+'vi'='annevi'
'annevi' anagrammed gives 'VIENNA'.
(Other definitions for vienna that I've seen before include "Capital city of Austria" , "Capital on the Danube Canal" , "European city for New Year's Day concert" , "Adult home of Beethoven, Brahms, Mozart and Schubert" , "On the Danube, it was home to many great composers" .)