clue in
verb- To inform or tell. · It looks like somebody finally clued them in that the intercom was broken the whole time.
From the library
Instead of that, he had intended, before his plans were nipped, to send me the clue in this envelope.
“We had no clue in the Acton affair.
No doubt the object of our journey was to catch him in the very act, and I could not but admire the cunning with which my friend had inserted a wrong clue in the evening paper, so as to give the fellow the idea that he could continue his scheme with impunity.
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