Tread down (7)
I believe the answer is:
trample
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tread down</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 trample that I've seen before include "Crush with the feet" , "squash" , "Ruthlessly crush -- nut performed a lot (anag)" , "Flatten" , "Heedlessly tread down" .)