The public should be 'clued in' to what's happening. [=should be told about what's happening]
He doesn't have a 'clue' when it comes to fixing cars. [=he knows nothing about fixing cars]
He's totally 'clued in on' [=he knows a lot about] the latest computer developments.
(..) house search of Lugash for the thief... "who Monday night stole the fabled Pink Panther diamond... "from the Royal Museum here. "According to authorities the only clue is a white monogrammed man's glove... with the initial 'P'." Well, what do you think? That you didn't spend your time (..)1975 The Return of the Pink Panther
(..) Have you taken a sample of this wax? Wax is wax. Oh, this is where you are wrong. Wax is not just wax. In this case it is a clue. English wax, French wax, domestic wax. The inspector is right. Have the wax tested immediately. It is my guess that you (..)1975 The Return of the Pink Panther