Possible Clues:

• Comfortable situation that could go downhill?
• State of financial comfort is what the postman wants!
• Low-stress address?
• Where the wealthy live? (2 words)
• Comfortable state of life
• Rye Estates may offer financial security
• Financial security obtained by a setter? Yes, cryptically
• Simple area of postman's work offering financial security
• Ray's settee kind of offers a level of comfort to financial types
• Financial security, so to speak