They had some clue to a treasure-laden ship which had foundered there long ago.

Indeed, I never would have left the country until I had found you, or had some clue to your deaths.

But I knew I had some clue to it, so I looked through some books by Rudyard Kipling, and found that Chela meant 'Disciple.'

Had some clue stared me in the face and I'd missed it?

"Werner must really have had some clue," murmured Mackay, dazed.