Race in a slalom (3)
I believe the answer is:
ski
'race in a slalom' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ski that I've seen before include "Participate in winter sport" , "Winter-sports item" , "Engage in a winter sport" , "Glide ove snow" , "Go on snow runners" .)