Pretty backdrops in Rhine city (4)

I believe the answer is:

bonn

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'rhine city' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for bonn that I've seen before include "Rhine city" , "W German capital 1949-90" , "Former capital of the German Federal Republic" , "Former West German capital" , "old European capital" .)

I've seen this clue in the Sydney Morning Herald.

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