Working outraged past student (12)
I believe the answer is:
postgraduate
'student' is the definition.
(postgraduate is a kind of student)
'working outraged past' is the wordplay.
'working' is an anagram indicator.
'outraged'+'past'='outragedpast'
'outragedpast' with letters rearranged gives 'POSTGRADUATE'.
(Other definitions for postgraduate that I've seen before include "advanced student" , "Continuing student" , "Research student" , "Senior student" , "Person studying after obtaining a degree" .)