Settle the score in Geneva perhaps (6)
I believe the answer is:
avenge
'settle the score in geneva perhaps' is the definition.
I can't judge whether this defines the answer.
'geneva perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'geneva' with letters rearranged gives 'AVENGE'.
Can you help me to learn more?
(Other definitions for avenge that I've seen before include "eg Nave (anag.)" , "Dish out a dose of own medicine" , "Geneva (anag)" , "To seek vengeance" , "Get back at for (a wrong)" .)