Dictator recalled in Marmara Sea chronicle (6)
I believe the answer is:
caesar
'dictator' is the definition.
(I've seen this in another clue)
'recalled in marmara sea chronicle' is the wordplay.
'recalled' says the letters should be written in reverse (to recall can mean to bring something back).
'in' indicates a hidden word.
'raseac' is hidden within 'marmara sea chronicle'.
'raseac' written backwards gives 'CAESAR'.
(Other definitions for caesar that I've seen before include "leader who acts like a dictator" , "Top man" , "Title of the Roman emperors" , "See 13 Across" , "Emperor of ancient Rome, like Julius" .)