Exploit dictator's measures (4)
I believe the answer is:
feat
'exploit' is the definition.
(I know that exploit can be written as feat)
'dictator's measures' is the wordplay.
'dictator' becomes 'f' (I have seen 'German dictator ' mean 'f' so perhaps 'dictator' could also mean 'f').
'measures' becomes 'eat' (I can't explain this - if you can you should give a lot more credence to this answer).
'f'+'eat'='FEAT'
Can you help me to learn more?
(Other definitions for feat that I've seen before include "Significant achievement" , "Exploit; achievement" , "Great deed" , "Notable act" , "An accomplishment of fate" .)