Former West German capital (4)

I believe the answer is:

bonn

'former west german capital' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for bonn that I've seen before include "West German capital, 1949-90" , "Rhine city" , "W German capital 1949-90" , "Capital of the former West Germany" , "Capital of West Germany, 1949-1990" .)

I've seen this clue in the Evening Standard.

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