Related Clues:

• It's delivered regularly
• Letter carriers carry it
• Post for men, by the sound of it
• Contents of a letter box
• Armour
• Shipping box: Abbr
• With 37-Across, perform perfunctorily ... or a hint to the ends of 16-, 25-, 41- and 55-Across
• In African country I picked up a little post
• Postal system
• 8 1/2" x 11" paper size: Abbr
• Something that can be 'dead' that was never alive
• Something you may ask to have held while you're away
• Knight-wear?
• Abbr. on a paper tray
• Rejecting some parliamentary post