Arouse hostility against one incorrectly (10)
I believe the answer is:
antagonise
'arouse hostility' is the definition.
(to antagonise is to annoy or provoke hostility)
'against one incorrectly' is the wordplay.
'incorrectly' indicates anagramming the letters (I've seen this in other clues).
'against'+'one'='againstone'
'againstone' is an anagram of 'ANTAGONISE'.
(Other definitions for antagonise that I've seen before include "anger" , "Bug" , "Create hostility" , "Cause opposition" , "Arouse hostility" .)