Somewhat insane Roman? (4)

I believe the answer is:

nero

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'somewhat insane roman?' is the definition.
'nero' can be an answer for 'roman?' (I've seen this before). I am not sure about the 'somewhat insane' bit.

'somewhat insane roman?' is the wordplay.
'somewhat' indicates the answer is hidden within the clue.
'NERO' is hidden in the letters of 'insane roman'.

Can you help me to learn more?

(Other definitions for nero that I've seen before include "Roman Emperor, 54-68 AD" , "Roman tyrant" , "Ruler" , "Roman emperor, d. AD68" , "Emperor who played the fiddle" .)

I've seen this clue in The Sun and The Telegraph.

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