Impede, with "down" (3)
I believe the answer is:
bog
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">impede with down</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bog that I've seen before include "Swamp" , "Wet spongy ground" , "Wet spongy land" , "Morass" , "convenience" .)