Eye swelling (4)
I believe the answer is:
stye
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">eye swelling</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for stye that I've seen before include "Eyelid infection" , "swelling by organ" , "nasty spot" , "Inflammation around the eye" , "Animal pen" .)