Frankenstein, by Mary Shelley.
The famous horror story that includes a Clue is "The Tell-Tale Heart" by Edgar Allan Poe. In the story, the protagonist, driven by guilt, hears the beating of the old man's heart he has just murdered under the floorboards, providing a crucial clue to his crime.
The oogly boogers
It really isn't horror but it's in the movie "Clue" based on the board game.
Flash- forward
i have no clue
The Clue game and movie are fiction.
I have no clue. Sorry.
you tell me we have no clue
I don't have a clue
I have no clue!
i have no clue
I have know clue