Sore; fistula (5)
I believe the answer is:
ulcer
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">sore</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">fistula</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for ulcer that I've seen before include "Cruel kind of body sore" , "Cruel sort of body sore" , "Cruel sort of open sore" , "Sore spot" , "Inflammatory internal or external lesion" .)