Last Julio-Claudian emperor (4)
I believe the answer is:
nero
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">last julio-claudian 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 "Emperor (who fiddled while Rome burned?) d. AD68" , "Roman arsonist and fiddler" , "Barbarous Roman emperor" , "Emperor said to have fiddled as Rome burned" , "Roman Emperor, 54-68 AD" .)