The Censor of Rome (4)
I believe the answer is:
cato
'the censor of rome' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cato that I've seen before include "Marcus Porcius - , Roman politician, censor" , "Ancient Roman censor" , "Senator" , "Roman statesman" , "classical writer" .)