clue >> /klu/
Definition: [transitive verb] Inform someone about a particular matter.
Definition: [noun] A piece of evidence or information used in the detection of a crime or solving of a mystery.
Example: police officers are still searching for clues
Definition: [noun] A verbal formula giving an indication as to what is to be inserted in a particular space in a crossword or other puzzle.
Example: a long-pondered clue in a half-completed crossword