Hydrophobia (6)
I believe the answer is:
rabies
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hydrophobia</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rabies that I've seen before include "make you hate water!" , "Disease transmitted through saliva" , "Dangerous viral disease" , "illness (like 13)" , "Name of disease from Serbia in 26 Down" .)