Oxen's harness (4)
I believe the answer is:
yoke
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">oxen's harness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for yoke that I've seen before include "Oppressive rule" , "get loaded and pull?" , "Wooden crosspiece or burdensome restraint" , "Oxen harness" , "Bond of servitude" .)