Senior government official of the city states of Venice or Genoa (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
doge
(Other definitions for doge that I've seen before include "Former title of the chief magistrate in Venice" , "Old Italian chief magistrate" , "Old chief magistrate in Venice and Genoa" , "Old lord of Venice" , "Title of former ruler of Venice" .)