Tiredness affected objector (9)
I believe the answer is:
dissenter
'objector' is the definition.
(I know that objector can be written as dissenter)
'tiredness affected' is the wordplay.
'affected' indicates anagramming the letters.
'tiredness' is an anagram of 'DISSENTER'.
(Other definitions for dissenter that I've seen before include "One who differs among residents" , "A non-orthodox" , "One who objects" , "One not agreeing" , "Nonconformist" .)