Infamous Roman emperor (4)
I believe the answer is:
nero
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">infamous roman emperor</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for nero that I've seen before include "Matricidal emperor" , "Wicked fiddler" , "Tyrannical Roman emperor" , "Emperor, 'burnt' Rome" , "Roman tyrant" .)