They learn how to manipulate teachers to gain clues about what the teacher really wants.

None of them had gained a clue to these amazing murders.

The Shadow was gaining definite clues to what actually had happened.

The Shadow did not hold the complete answer; but he had gained a clue that might be useful.

From one of these, The Shadow might gain a clue.

The Shadow had gained a clue to coming crime.

But he had gained a clue that would lead him to Myram's murderer.

It was Cardona who had gained a clue to this night's episode.

Successful answers gain clues that will be helpful later in solving a mystery.

"But how did you gain so prompt a clue?"