Vehicle for travelling over snow (6)
I believe the answer is:
sledge
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vehicle for travelling 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 sledge that I've seen before include "Vehicle mounted on runners" , "In the field, abuse" , "Vehicle for use in snow" , "Narrow cart with runners for travelling on snow" , "heavy tool" .)