| Answer | Crossword Clue |
|---|---|
| DEAD | ...-letter office |
| DEAD | .. letter office |
| MEMO | Office letter |
| POSTMORTEM | Dead-letter office |
| TAKEA | "... letter" (office order) |
| NIXIE | Undeliverable letter, in post-office slang |
| NIXIE | Undeliverable letter, in post-office talk |
| NIXY | Letter the Post Office cannot deliver. |
| NIXIE | Dead letter, in post office talk |
| STE | Abbr. on a letter to an office building |
| STE | Abbr. on a letter to an office complex |
