Scold the agent over, unfairly (7)
I believe the answer is:
reprove
'scold' is the definition.
(thesaurus)
'the agent over unfairly' is the wordplay.
'the agent' becomes 'rep' (short for representative).
'unfairly' indicates an anagram (I've seen this in other clues).
'over' with letters rearranged gives 'rove'.
'rep'+'rove'='REPROVE'
(Other definitions for reprove that I've seen before include "Chide" , "Criticise" , "Admonish" , "Scold" , "carpet" .)