Former capital of West Germany (4)
I believe the answer is:
bonn
'former capital of west germany' 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 "Rhine city" , "Beethoven's birthplace, old capital" , "West German capital, 1949-90" , "First capital of the German Federal Republic" , "Former West German capital" .)