I anger con about lack of education (9)
I believe the answer is:
ignorance
'lack of education' is the definition.
(being ignorant or uneducated)
'i anger con about' is the wordplay.
'about' is an anagram indicator.
'anger'+'con'='angercon'
'angercon' is an anagram of 'gnorance'.
'i'+'gnorance'='IGNORANCE'
(Other definitions for ignorance that I've seen before include "......... of the law is no excuse for breaking it" , "bliss, they say" , "Lack of knowledge" , "Stupidity" , "State of unknowing" .)