Swiss city and canton (6)
I believe the answer is:
geneva
'swiss city and canton' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for geneva that I've seen before include "Juniper flavoured spirit - Red Cross HQ" , "Swiss city housing the Red Cross headquarters" , "European city" , "Avenge (anag) - type of gin" , "Calvin's city" .)