clue A clue is a hint or an indication that something happened. Clues help a person gain knowledge or find information. - Police investigators look for clues at the scene of a crime.
- Clues are useful when trying to solve a mystery.
- Criminals are likely to leave clues which can be used to determine who did what and where.
- Scientists use clues to form theories and hypotheses.
- Historians discover clues that support their ideas about activities in the past.
 He’s looking for clues.
The word "clue" is commonly used in some popular expressions: - She has no clue as to the whereabouts of her cell phone. (She doesn’t know where her cell phone is.)
- I have not a clue. (I don’t know.)
- He’s really needs to get a clue. (He needs to pay more attention to what’s happening.)
- He’s totally clueless. (He doesn’t understand something that’s important.)
- Clue me in. (Tell me what’s happening.)
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He’s looking for clues.