(now rare) A strand of yarn etc. as used to guide one through a labyrinth; something which points the way, a guide. / Information which may lead one to a certain point or conclusion.

To provide with a clue. / To provide someone with information which he or she lacks (often used with "in" or "up").

plural of clue

Third-person singular simple present indicative form of clue

(informal) To inform or tell.

present participle of clue

The board game Cluedo whose goal is to solve the mystery of a fictitious murder.

Response affirming that the speaker does not have knowledge pertaining to an interlocutor's question

(idiomatic) A metaphorical stick used to beat information or understanding into a slow learner.

Third-person singular simple present indicative form of have a clue