Detest, despise (5)
I believe the answer is:
abhor
<span class="explanation-format__ClueExplanation">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">despise</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(abhor means to detest)</span><br/ ><br/ ></span>
(Other definitions for abhor that I've seen before include "Detest, hate" , "Dislike very much" , "can't stand" , "Regard with disgust and hatred" , "Find disgusting" .)