Glide over snow (3)
I believe the answer is:
ski
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">glide over snow</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ski that I've seen before include "Take part in a winter sport" , "Sliding runner" , "Hit the slopes" , "Slide on snow" , "Descend fast" .)