Today without a clue means to have no knowledge of something, but it once had a different meaning.
A clue (also spelled clew) was a globular ball formed from coiling worms or the like or, more specifically, a ball of thread.
In Greek myth – the tale of Theseus and the Minotaur. Theseus entered the labyrinth to kill the half-man, half-bull Minotaur. He did so but was only able to find his way out by retracing his path, marked by the string given to him by Ariadne. So, Theseus ‘had a clew’ about the safe route out of the maze and was able to escape.
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