Detest, despise (5)
I believe the answer is:
abhor
This clue is a double definition.
'detest' is the first definition.
(abhorring is a kind of detesting)
'despise' is the second definition.
(abhor means to detest)
(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" .)