From Longman Dictionary of Contemporary Englishnot have a clue (where/why/how etc)not have a clue (where/why/how etc)informal a) NOT KNOWto not have any idea about the answer to a question, how to do something, what a situation is etc ‘Do you know how to switch this thing off?’ ‘I haven’t a clue.’ Until I arrived here, I hadn’t got a clue what I was going to say to her. b) BAD ATto be very stupid, or very bad at a particular activity Don’t let Mike cook you dinner; he hasn’t got a clue. I haven’t a clue how to talk to girls.not have a clue (where/why/how etc) about No point asking Jill – she hasn’t got a clue about maths. → clue
Examples from the Corpus
not have a clue (where/why/how etc)• After nine years of marriage to her I did not have a clue myself. 