Student of Seneca (4)
I believe the answer is:
nero
'student of seneca' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nero that I've seen before include "Emperor said to have started the fire that destroyed Rome" , "Wicked fiddler" , "Roman emperor who fiddled while Rome burned" , "Imperial Roman fiddler" , "Ruler" .)