Winds up near Swiss capital (6)

I believe the answer is:

closes

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'winds up' is the definition.
(I've seen this in another clue)

'near swiss capital' is the wordplay.
'near' becomes 'close' (synonyms).
'swiss capital' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'close'+'s'='CLOSES'

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(Other definitions for closes that I've seen before include "Wind up" , "Shuts" , "comes to an end" .)

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