have a clue

(idiom) to have an idea

Example Sentence:

A: How did you know your wife was having a relationship with another man?
B: I had a clue when I found a gift that he gave her. Now I’m sad.

A: Do you know what time it is?
B: I don’t have a clue!

The man didn’t have a clue why the police were at his house.

Similar idioms:

1. look a gift horse in the mouth
2. kick someone out
3. get along like a house on fire