They usually lead to the quarry (6)

I believe the answer is:

spoors

I'm a little stuck... Click here to teach me more about this clue!

'they' is the definition.
Both the definition and answer are plural nouns.
Maybe you can see an association between them that I don't see?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for spoors that I've seen before include "Hunters follow them when pursuing game" , "What the hunter follows in pursuing game" .)

I've seen this clue in The Guardian and The Globe and Mail.

Want a hint initially instead of a full solution? Install my app