Brushwood (5)
I believe the answer is:
scrub
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">brushwood</span>' is the definition.<br/ ><span class="explanation-format__explanation">(both can mean vegetation)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for scrub that I've seen before include "Brush dirt off - delete - stunted vegetation" , "Clean by rubbing really hard" , "Get rid of" , "Scour; brushwood" , "Powerful wash" .)