Turn against one? (10)
I believe the answer is:
antagonise
'turn against one?' is the definition.
I can't tell whether this definition defines the answer.
'turn against one?' is the wordplay.
'turn' indicates anagramming the letters.
'against'+'one'='againstone'
'againstone' is an anagram of 'ANTAGONISE'.
Can you help me to learn more?
(Other definitions for antagonise that I've seen before include "Cause opposition" , "Create hostility" , "anger" , "Provoke hostility" , "Get on the wrong side of" .)