Intensely dislike (6)
'intensely dislike' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for detest that I've seen before include "Hate a lot" , "Dislike thoroughly" , "Be unable to stand" , "Not like" , "Greatly hate" .)
(Other definitions for loathe that I've seen before include "Dislike intensely" , "Find disgusting" , "Cordially detest, thoroughly dislike" , "Feel disgust for (person)" , "Can't abide" .)
'intensely dislike' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for hate that I've seen before include "Strong aversion" , "Despise" , "[OPPOSITE OF] Be besotted with" , "Fury" , "Antipathy" .)