Russian horse-drawn vehicle (6)
I believe the answer is:
troika
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">russian horse-drawn vehicle</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for troika that I've seen before include "Russian three-horse coach" , "cart" , "Russian carriage pulled by three horses abreast" , "Threesome" , "Russian vehicle pulled by three horses" .)