Hinder, obstruct (6)
I believe the answer is:
impede
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">hinder</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that impede is a kind of hinder)</span><br/ ><br/ >'<span class="explanation-format__original">obstruct</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that obstruct is a kind of impede)</span><br/ ><br/ ></span>
(Other definitions for impede that I've seen before include "Cramp" , "Delay; block progress of" , "Delay or obstruct" , "Hamper" , "check" .)