Related Clues:

• PO delivery
• 'Put a sock ___!'
• Signature piece?: Abbr.
• Env. enclosure
• "What's ___ for me?"
• Quick approval: Abbr.
• Post office delivery: Abbr.
• P.O. delivery
• Embroidered ltr., often
• Letterhead?: Abbr.
• P.O. piece
• 'What's -- for me?'
• P.O. box item
• Epistle: Abbr.
• Quick O.K.: Abbr.