The clue "What a key opens" last appeared in the The Washington Post crossword on September 10, 2018. The correct answer for this puzzle is "LOCK", a 4-letter word.
Solution LOCK is 4 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is LOCK with 4 letters, and the shortest is LOCK with 4 letters.
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The solution is 4 letters long.