Hindrance, obstruction (10)
I believe the answer is:
impediment
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">hindrance</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that hindrance can be written as impediment)</span><br/ ><br/ >'<span class="explanation-format__original">obstruction</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that obstruction can be written as impediment)</span><br/ ><br/ ></span>
(Other definitions for impediment that I've seen before include "opposition" , "Let" , "Obstacle" , "Hindrance, obstruction" .)