Motorcycling event (8)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
scramble
'motorcycling event' is the definition.
This is all the clue.
(Other definitions for scramble that I've seen before include "Muddle up" , "Motorbike rally" , "Disorderly rush" , "keep communication secret" , "Jockey for position" .)