Block, clog (8)
I believe the answer is:
obstruct
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">block</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">clog</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for obstruct that I've seen before include "Hamper" , "Hinder or impede" , "Stymie" , "Get in the way of" , "Block the passage or shut out the view" .)