"When is a door not a door? When it's ___" (classic riddle)

Let's find possible answers to ""When is a door not a door? When it's ___" (classic riddle)" crossword clue. First of all, we will look for a few extra hints for this entry: "When is a door not a door? When it's ___" (classic riddle). Finally, we will solve this crossword puzzle clue and get the correct word. We have 1 possible solution for this clue in our database.