clue
clue n
OE clew; Ariadne's ball of thread that led Theseus through the labyrinth of King Minos on Crete.
- Skein; yarn; string; line; twine; [fig.] suggestion; hint; cue; key; guideline; that which points the way; [metaphor] silkworm's thread; caterpillar's strand for spinning a cocoon.