Channel or trench (5)
I believe the answer is:
ditch
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">channel</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(a small channel or trench in the ground)</span><br/ ><br/ >'<span class="explanation-format__original">trench</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">or</span>' is the link.<br/ ></span>
(Other definitions for ditch that I've seen before include "Dump (informal)" , "Scrap" , "Boundary trench" , "Excavated channel" , "Type of trench" .)