Ditch – ___ coat (6)
I believe the answer is:
trench
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">ditch</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that trench is a type of ditch)</span><br/ ><br/ >'<span class="explanation-format__original">coat</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(trench coat is a kind of coat)</span><br/ ><br/ ></span>
(Other definitions for trench that I've seen before include "A deep ditch, as dug for troops" , "Long, narrow excavation" , "Drain" , "deep channel" , "depression" .)