Detest, loathe (5)
I believe the answer is:
abhor
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">detest</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(abhorring is a kind of detesting)</span><br/ ><br/ >'<span class="explanation-format__original">loathe</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for abhor that I've seen before include "Execrate" , "Find disgusting" , "Regard with repugnance" , "Find horrible" , "Not like" .)