Path commentator's travelled up (4)
I believe the answer is:
road
'path' is the definition.
(I've seen this before)
'commentator's travelled up' is the wordplay.
'commentator's' indicates a 'sounds like' (homophone) clue (as it might sound from someone commentating).
'travelled up' becomes 'rode' (rode up on a horse).
'rode' is a homophone of 'ROAD'.
(Other definitions for road that I've seen before include "Abbey -, Beatles album" , "course" , "Route travelled by sea" , "Way travelled by boat" , "See 2" .)