Clue
/klˈu/
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Definition
(noun) A strand of yarn etc. as used to guide one through a labyrinth; something which points the way, a guide.
Sentence Examples
The habits of highly intelligent people offer a clue as to how to do that.
There was no clue as to the identity of the murderer.
CEFR Practice Quiz
The detective found an important ____ at the scene of the crime.