Related Clues:

• It might have the heading "Re:"
• Check casher, say
• Bus. note
• Sheet on a desk
• One in an office exchange
• Workplace communication
• Like a redeemed coupon
• Gap, absence
• Blank, invalid
• A blank
• - Currie, Br. politician
• Recall lines overlooked in short note
• Written note
• Empty; not valid
• Game not counted on the pools