Trample (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">trample</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tread that I've seen before include "Sole of a shoe" , "pace" , "Tyre moulding" , "between the car and the road" , "Surface of car tyre" .)
(Another definition for stepon that I've seen is " Treat harshly".)