Green Glass Door

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I will something like "There is a *blank*, but there is no *blank*." There is a secret in what you there is and isn't. One other person is trying to figure out what the secret is by saying "There is a *blank*, but there is no *blank*." until I PM them, saying they got it, then they play along, and someone else tries to figure out the secret. I'll start, and someone else just go ahead.

There is a monkey, but there is no judge.

 

[Time Turner]

The judicial system is corrupted?

 

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I forgot to mention: It has to do with the spellings of the words, or if there are double letters, or triple letters. Not anything like that.