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Heading to Snowdonia on stony trail (5)

Ross

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.

Can you help me to learn more?

(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.
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