Possible Clues:

• Diplomatic mission
• Embassy
• 'A matter of the limb, perhaps, for diplomacy (8)'
• Arms trade leaders entertained by numerous delegates
• Diplomatic group or mission
• Something like a diplomatic armament, perhaps?
• Perhaps it's limberly that's so diplomatic
• A long tie (anag.)
• Diplomatic minister and staff, and their residence
• Body of delegates transferred to Ealing