Heading to Snowdonia on stony trail (5)

I believe the answer is:

spoor

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

'trail' is the definition.
(I know that spoor is a type of trail)

I don't understand the rest of the clue.

(Other definitions for spoor that I've seen before include "Animal track, trail" , "Beast's trail" , "24 [TRAIL]" , "Track of wild animal" , "Animal track or scent" .)

I've seen this clue in The Times and The Sunday Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.