Participant in match, heading off for journey (4)
I believe the answer is:
ride
'journey' is the definition.
(riding is a kind of journeying)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for ride that I've seen before include "Sally" , "Travel, by horse say" , "Travel (on a bike, perhaps)" , "Travel in or be carried on" , "Journey as passenger" .)