Avenge massacre in Switzerland (6)

I believe the answer is:

geneva

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'in switzerland' is the definition.
('Geneva' is part of 'switzerland')

'avenge massacre' is the wordplay.
'avenge' can be anagrammed to 'GENEVA'.
However, I am unsure how the anagram is indicated.

Can you help me to learn more?

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

I've seen this clue in The Globe and Mail.

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