a clue of thread

Shooting Stars

Senior Member
During a secret interview, in which a mutual confession of affection took place, Ariadne furnished him with a sharp sword and a clue of thread, the end of which she desired him to fasten at the entrance to the labyrinth and to continue to unwind it till he reached the lair of the Minotaur.(Myths and Legends of Ancient Greece and Rome)

Is a clue of thread an old-fashioned phrase meaning a ball of thread?
I have looked up in the dictionary, but have not got an answer.

Thank you.
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