Slide down a slope (3)
I believe the answer is:
ski
'slide down a slope' 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 "Hit the slopes" , "Go on snow runners" , "Glide on snow with special footwear" , "Sport on piste" , "Slide on snow" .)