Urticaria (5)
I believe the answer is:
hives
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">urticaria</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for hives that I've seen before include "Bee homes" , "Eruption" , "Apiarists' essentials?" , "Bee colonies - nettle rash" , "Nettle-rash" .)