Possible Clues:

• Support is key for Dublin 15
• Following joke, ultimately lame conclusion to address?
• Mail sorting help
• Support is key for Dublin fifteen
• Address identifier
• Job English medic set up that helps with deliveries
• Support for a set of standards produced by Dublin fifteen, for instance?
• What’s after correspondent’s initial lines of address?
• Part of an address
• Actively stop co-ed becoming a kind of lottery