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.
(..) Mr Powell, your explanation for this, please? I have no explanation. Certainly no excuses. Except to once again respectfully remind the council that we are working from clues based on ancient cosmological models... predating Aristotle. But I'm happy to announce that we're almost ready. (..)2001 Lara Croft: Tomb Raider