| Answer | Crossword Clue |
|---|---|
| NIXIE | Undeliverable letter |
| NIXIE | Undeliverable letter, to postal employees |
| NIXIE | Undeliverable letter, in post-office slang |
| NIXIE | Undeliverable letter, to a postal worker |
| NIXY | Undeliverable letter, in P. O. parlance. |
| NIXIE | Undeliverable letter, in post-office talk |
| nixie | a letter or parcel that is undeliverable because of a faulty or illegible address. |
| nixies | letter or parcel that is undeliverable by the post office because of a faulty or illegible address |
| nixie | letter or parcel that is undeliverable by the post office because of a faulty or illegible address |
