If we could just get one solid, certain clue.

There are certain clues to what could have happened.

Potential informants are told to look for certain clues.

Moreover, there are certain additional clues which seem to support the authenticity hypothesis.

It would be a certain clue that we were up to no good.

Very well, but we can deduce who it was from many and certain clues.

The list, excerpted below, offers certain clues about the life these two may lead.

I fancied that perhaps you preferred to keep certain clues a secret.

They left certain clues and data for use by whatever generations might be able to understand them.

In spite of that, I've discovered how to read certain clues.