Site of the YMCA and International AIDS Society headquarters (6)

I believe the answer is:

geneva

(Other definitions for geneva that I've seen before include "city of biblical significance" , "International agreement on the treatment of civilians and captured or wounded military personnel in wartime" , "Lake between Switzerland and France" , "Swiss city, lake" , "Swiss city and canton" .)

I've seen this clue in The Wall Street Journal.

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