Crossword Genius

Get payback for turning up to promote German city (6)

Ross

I believe the answer is:

geneva

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'city' is the definition.
(Geneva is an example)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for geneva that I've seen before include "Convention site" , "Swiss lakeside city" , "Some bands" , "old Calvinist stronghold" , "Calvin's city" .)

I've seen this clue in The Independent.
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