To provide someone with information which he or she lacks (often used with "in" or "up").
To provide with a clue.
Information which may lead one to a certain point or conclusion.
An object or a kind of indication which may be used as evidence.
Insight or understanding ("to have a clue [about]" or "to have clue". See have a clue, clue stick)
To inform somebody, especially to supply someone missing or missed information.
To substitute for somebody or something.
To complete a form or questionnaire with requested information.
To beat up; to physically assault.
To fill; to replace material that is absent or has been removed.