Not have a clue / have no clue
Meaning: to be completely unable to guess, understand, or deal with something
Example: "Who invented algebra?" "I don't have a clue." Don't ask your father which key to press - he hasn't got a clue about computers.
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Example: "Who invented algebra?" "I don't have a clue." Don't ask your father which key to press - he hasn't got a clue about computers.