Related Clues:

• Monthly payer
• Thrifty customer?
• Flat cat?
• Boarder
• One paying a flat fee
• Many a summer resident
• He's not buying it
• Crofter, in Britain
• Ricardo, to Mertz
• Many a monthly check writer
• One with a flat
• Room renter
• Apartment occupant
• Apartment dweller, perhaps
• Jack, Janet or Chrissy, to Mr. Roper