Period of sickness (7)
I believe the answer is:
illness
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">period of sickness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for illness that I've seen before include "Sick condition" , "Disease, sickness" , "suffering this" , "Period of sickness" , "Ailment, disorder" .)