Put a Letter Inside This Before Mailing It

This page is the CodyCross answer for the clue below from Underground Worlds, Group 2178, Puzzle 5 (Cemetery and Crypt).

Question is: Put a Letter Inside This Before Mailing It

and the answer is: ENVELOPE

Word Meaning:

ENVELOPE — A paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing.

Definitions from Wiktionary.

Put A Letter Inside This Before Mailing It - Underground Worlds CodyCross Answers | CodyCross Solutions