Crossword puzzle clue "undeliverable letter in post office talk"

Here are the possible solutions for undeliverable letter in post office talk clue

Answer
Clue
Relevancy
nixie
Clue
Undeliverable letter, in post-office talk
Undeliverable letter
Undeliverable letter, to a postal worker
Dead letter, in post office talk
Definition
a female nix or malignant water-spirit, also NIXY
yak
Clue
Talk and talk and talk and talk
deadletter
Clue
It's undeliverable
Undeliverable bit of mail
deadmail
Clue
It's undeliverable and unreturnable

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