Ill will, enmity (6)
I believe the answer is:
animus
This clue is a double definition.
'ill will' is the first definition.
(animus is a kind of ill will)
'enmity' is the second definition.
(animus is a kind of enmity)
(Other definitions for animus that I've seen before include "US man I turn to with hostility" , "Motivating spirit" , "Heat" , "Hostility shown in speech or action" , "Hostile spirit in speech or action" .)