Lay waste (9)
I believe the answer is:
devastate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lay waste</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 devastate that I've seen before include "Lay waste or overwhelm with grief" , "Lay waste or totally crush" , "floor" , "Spoil" , "Ruin" .)