Scour; bush (5)
I believe the answer is:
scrub
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">scour</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that scour can be written as scrub)</span><br/ ><br/ >'<span class="explanation-format__original">bush</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that bush can be written as scrub)</span><br/ ><br/ ></span>
(Other definitions for scrub that I've seen before include "Drop" , "Wash vigorously" , "clean-up" , "Scour; cancel" , "Rub hard with a brush" .)