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clue (one) in
To give one new information or to correct misinformation. Why is everyone mad at Bruce this morning? Clue me in. Someone needs to clue her in before she keeps spreading these lies.
clue someone in (on something)
to inform someone of something. Please clue me in on what's been going on. Clue in those guys before it's too late.
Also, clue up. Give someone guiding information, as in It's time someone clued us in on what's happening, or I hope they clue us up soon. This expression, which uses the verb clue in the sense of "inform," is sometimes put simply as clue (as in I'll clue you-this isn't going to work). [Colloquial; mid-1900s] Also see not have a clue.
To provide someone with important or exclusive information about something: I hoped my friend who worked for a senator would clue me in to what the government was planning to do. My friend clued me in on the local club scene.