
not have a clue 
IDIOM
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 English Dictionary
English Dictionarynot have a clue INFORMALto be completely unable to guess, understand, or deal with something: "Who invented algebra?" "I haven't a clue."
 "Who invented algebra?" "I haven't a clue." Don't ask your father which key to press - he hasn't got a clue about computers.
 Don't ask your father which key to press - he hasn't got a clue about computers.  [TahlilGaran] Advanced Learner's Dictionary ▲
  Idioms
Idiomsnot have a clue(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.'
 'How much do houses cost in Yorkshire?' 'I haven't got a clue.' Internet researchers in the 1980s didn't have a clue about the exciting online landscapes of the future.
 Internet researchers in the 1980s didn't have a clue about the exciting online landscapes of the future. (often + 
about)
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:
 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.
 Before most doctors have a clue about what a new drug can do, it's being sold to the public.  [TahlilGaran] English Idioms Dictionary ▲
 not have a clue(not) know anything about something
 I do not have a clue who took the laptop computer.
 I do not have a clue who took the laptop computer.
  [TahlilGaran] English Idioms Dictionary ▲