clue

noun1 of 2

a piece of information that helps explain a situation or provide a solution to a problem

• “I have no clue how to solve this problem.”Tatoeba
• “At last, he found a clue to the mystery.”Tatoeba

Sentences from Tatoeba show real usage. A word can have several meanings, so a sentence may use another one.

verb2 of 2

To provide someone with information which he or she lacks (often used with "in" or "up").