Not even a good dramatic part (3)
I believe the answer is:
odd
'not even' is the definition.
('odd' is the opposite to 'even')
'a good dramatic part' is the wordplay.
'part' indicates a hidden word.
'ODD' is hidden in the letters of 'good dramatic'.
(Other definitions for odd that I've seen before include "Unmatched" , "Unusual, strange" , "Eccentric or unpaired" , "Not even; strange" , "Peculiar or eccentric" .)