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3. not have a clue

not have a clue

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not have a clue

also without a clue

to have no knowledge or information about something The guy doesn't have a clue what forestry is all about.

Usage notes: sometimes used in the form have a clue: Before most doctors have a clue about what a new drug can do, it's being sold to the public.

See also: clue, have, not

not have a clue

Have no idea or inkling about something, as in Jane doesn't have a clue as to why John won't call her, or Do you know what's wrong with the boiler?-No, I haven't a clue. This usage was first recorded in 1928.

See also: clue, have, not