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So much missinformation in here.
It's "the ghost is clear"
An adaption of a very old idiom "the ghost is queer".
It is an olde english term from medival times when ghosts where common place along with knights, dragons, wizards and elves. Most ghosts were mundane and normal things but every now and then one would be up to no good and act weird by haunting someone. Hence the term "the ghost is queer". Queer simply used to mean weird back then. As ghosts became extinct the term slowly attapted into "the ghost is clear" meaning "nothing in here, not even a ghost".
It's pretty common knowledge here in England.
And I have an ounce of the finest green to hand too.