Related Clues:

• Letters delivered
• It's signed, sealed and delivered
• Battleship's protection
• Junk __
• Postal Service delivery
• Covering for combat
• Inbox stuff
• Mother not well missing little metallic dress of armour
• It may be registered or certified
• Postal letters
• Medieval museum exhibit
• Some airplane cargo
• Round Table array
• Armor of a sort
• Mail at a castle