Eye infection (4)
I believe the answer is:
stye
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">eye infection</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for stye that I've seen before include "Inflammation on eyelid" , "Infection on the edge of the eye" , "Ocular affliction" , "Eyelid infection" , "Eye blemish" .)