Possible Clues:

• Sister gets firm over clerical officer sent to court in England
• Papal ambassador about to be accepted by new union
• Messenger goes to see? Quite the contrary
• Sister goes to Channel Islands with ring for ambassador
• Pope's man has a bit missing from incubation
• New global organisation getting firm about international ambassador
• Papal ambassador to a foreign court of government
• Pope's man, member of holy order with chinos, oddly
• Religious woman I encountered in business, representative of church
• The good sister has got to over a hundred and ten in the service of the Holy See