Beethoven's birthplace (4)
I believe the answer is:
bonn
'beethoven's birthplace' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bonn that I've seen before include "First capital of the German Federal Republic" , "old European capital" , "German city" , "Former West German capital" , "Beethoven's birthplace, old capital" .)