Abomination (5)
I believe the answer is:
odium
'abomination' is the definition.
(I know that abomination can be written as odium)
This is the entire clue.
(Other definitions for odium that I've seen before include "Widespread hatred or abhorrence (5)" , "Widespread contempt or hatred" , "Dislike of someone, or something hated" , "General hatred or disgust" , "shame!" .)