Person or thing that's abhorred (8)
I believe the answer is:
anathema
'person or thing that's abhorred' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for anathema that I've seen before include "Object of repulsion" , "It's detested or abhorred" , "Accursed by the Church" , "Bete noir" , "hated person" .)