clue in on = clue in about = give information
examples:
- At the seminar they will clue us in on new techniques.
- The professor will clue us in on new developments in medicine.
- I don't know the news. Could you clue me in?
- I have to learn the facts. Will you please clue me in?
- Her mother clued her in a bit about what to say.
- My lawyer has clued me in about what to do.
