Person who challenges paid examiner? (9)
I believe the answer is:
protester
'person who challenges' is the definition.
(eg someone challenging a decision)
'paid examiner?' is the wordplay.
'paid' becomes 'pro' (I've seen this in other clues).
'examiner?' becomes 'tester' (synonyms).
'pro'+'tester'='PROTESTER'
(Other definitions for protester that I've seen before include "Demonstrating kind" , "I strongly object" , "Demonstrator" , "objector" , "Person, we hear, not content" .)