Sicknesses (8)
I believe the answer is:
diseases
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sicknesses</span>' is the definition.<br/ ><span class="explanation-format__explanation">(disease is a kind of sickness)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for diseases that I've seen before include "Illness brought on by infections or diet" , "Afflictions, disorders" , "Disorders, illnesses" , "Illnesses, maladies" , "Sicknesses" .)