Scandal to argue about (7)
I believe the answer is:
outrage
'scandal' is the definition.
(I know that scandal can be written as outrage)
'to argue about' is the wordplay.
'about' is an anagram indicator.
'to'+'argue'='toargue'
'toargue' is an anagram of 'OUTRAGE'.
(Other definitions for outrage that I've seen before include "Deplorable insult" , "Shock horror!" , "Very angry reaction" , "Barbarity" , "Great anger" .)