Trail (3)
'trail' is the definition.
(spoor is a kind of trail)
This is the entire clue.
(Other definitions for spoor that I've seen before include "Animal track, trail" , "Track of wild animal" , "Beast's trail" , "24 [TRAIL]" , "Animal's track/scent" .)
'trail' is the definition.
(an animal's trail is its scent)
This is the entire clue.
(Other definitions for scent that I've seen before include "Distinctive aroma" , "Bouquet" , "Clue" , "Distinctive smell" , "Trail" .)
'trail' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for track that I've seen before include "Trace; path" , "One song on CD?" , "Mark left" , "Lines" , "Dog - path" .)
'trail' is the definition.
(both can mean to go behind)
This is all the clue.
(Other definitions for lag that I've seen before include "Fall behind; insulate" , "Wrap to protect from frost" , "person inside" , "Cover pipes" , "trail" .)
'trail' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for path that I've seen before include "Track, way for walkers" , "trail" , "Track made by walking" , "Bridleway" , "Footway or track" .)