Crossword clues for the word: LETTERDROP The word LETTERDROP has appeared as an answer to at least 7 crossword clues on different crossword puzzles. Crossword clues for LETTERDROP Showing 1 to 7 of 7 results Clue(s) Apt phrase spelled by the deleted ends of this puzzle's theme answers It may be used to pass secrets Opening at the post office ... or, when read as three words, a hint to the answers to the starred clues Post office convenience Slot at the post office Slot for mail Snail mail box