Possible Clues:

• Make right, perhaps in a not-so-right way
• Exact retribution for destruction of Geneva
• Dish out a dose of own medicine in Whitehaven General?
• Get one's own back with a volume on gene mutation
• Get even with a very English earl
• Repay (a wrong)
• Get back at for (a wrong)
• Even a score
• Punish a wrongdoer
• Get even with travel agency management centres