Hostility (6)
There are a few possibilities for this:
'hostility' is the definition.
(I know that hostility can be written as enmity)
This is the entire clue.
(Other definitions for enmity that I've seen before include "Hostility, bad feeling towards" , "evident in time?" , "Personal hostility" , "Hostility between opposing groups or nations" , "Hostility, ill-will" .)
'hostility' is the definition.
(synonyms)
This is all the clue.
(Other definitions for ill-will that I've seen before include "Enmity" , "Hostility" .)
'hostility' is the definition.
(short for aggression or aggravation)
This is all the clue.
(Other definitions for aggro that I've seen before include "Potential violence" , "Fighting" , "Violent disturbance" , "Slang for deliberate trouble-making" , "Hostility" .)
'hostility' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for opposition that I've seen before include "organized political group" , "those out of power" , "Rivalry" , "Political party" , "antagonism" .)
'hostility' is the definition.
(I know that aggression is a type of hostility)
This is all the clue.
(Other definitions for aggression that I've seen before include "Unprovoked attack" , "Use of armed force" , "Act of aggression,physical force" , "Belligerence -hostility" , "What eleven Ac displays" .)
'hostility' is the definition.
(I know that antagonism is a type of hostility)
This is all the clue.
(Other definitions for antagonism that I've seen before include "Active hostility" , "Active opposition" .)