Related Clues:

• Letter's need
• Apartment dweller
• Lease signatory
• Boardinghouse guest
• Flat denizen
• Studio occupant, perhaps
• Flat occupant
• Thrifty customer?
• Security deposit payer
• Boarder
• One paying a flat fee
• Many a summer resident
• He's not buying it
• Tenant, for one
• Half of an auto transaction, perhaps