A clue is a small piece of information that helps solve a problem or figure something out.
When we talk about clues in everyday conversation, usually it's related to solving mysteries, like puzzles or crimes. For example, if you're watching a detective show on TV, the main character might find a suspicious letter or a hidden key, which is a clue that helps them crack the case.
A strand of yarn etc. as used to guide one through a labyrinth; something which points the way, a guide.
To provide with a clue.
Example: The crossword compiler wasn't sure how to clue the word "should".
