Possible Clues:

• Chapel head from craft union has come all the way from Rome on a mission
• Pope's ambassador
• Sister from island taken in by company ambassador
• Papal emissary
• Pope's envoy
• Papal representative
• She may be one to start to have a papal mission
• Diplomatic representative of the pope
• 'In Latin, now it takes ten more to make an ambassador (6)'
• Now in Rome the messenger gets to ten