Exact satisfaction for trouble in Geneva (6)

I believe the answer is:

avenge

I'm a little stuck... Click here to teach me more about this clue!

'exact satisfaction for' is the definition.
(I've seen this in another clue)

'trouble in geneva' is the wordplay.
'geneva' anagrams to 'AVENGE'.
But, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for avenge that I've seen before include "Redress, vindicate" , "Even the score" , "Get satisfaction for wrong done" , "Get one's own back for" , "Repay (a wrong)" .)

I've seen this clue in The Irish Independent.

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