Glide on snow (3)
I believe the answer is:
ski
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">glide on 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 "What one might do in Alps" , "Snow blade" , "Aid to movement on snow" , "Descend fast" , "runner in winter" .)