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have a clue

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have a clue (about something)

Fig. to know anything about something; to have even a hint about someone or something. (Usually negative.) I don't have a clue about where to start looking for Jim. Why do you think I have a clue about Tom's disappearance?

See also: clue, have

not have a clue

  (informal)

to have no knowledge of or no information about something 'How much do houses cost in Yorkshire?' 'I haven't got a clue.' (often + about ) Internet researchers in the 1980s didn't have a clue about the exciting online landscapes of the future.

See also: clue, have