Poison ivy symptom (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">poison ivy symptom</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 itch that I've seen before include "Something that needs a scratch" , "Irritating feeling on the skin" , "cause irritation" , "It needs to be scratched" , "Tickle; urge" .)