An object or a kind of indication which may be used as evidence.
Information which may lead one to a certain point or conclusion.
Insight or understanding ("to have a clue [about]" or "to have clue". See have a clue, clue stick)
To provide with a clue.
To provide someone with information which he or she lacks (often used with "in" or "up").
The act or process by which a document is proofread.