Detest, loathe (5)
I believe the answer is:
abhor
I believe this clue is a double definition.
'detest' is the first definition.
(abhorring is a kind of detesting)
'loathe' is the second definition.
(synonyms)
(Other definitions for abhor that I've seen before include "Execrate" , "Find disgusting" , "Regard with repugnance" , "Find horrible" , "Not like" .)