Glides over snow (4)
I believe the answer is:
skis
'glides over snow' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for skis that I've seen before include "Engages in a winter sport" , "On these in slalom" , "Snow runners" , "Travels on snow" , "More than one runner" .)