Somewhat insaner old emperor (4)

I believe the answer is:

nero

'emperor' is the definition.
(Roman emperor)

'somewhat insaner old' is the wordplay.
'somewhat' indicates the answer is hidden within the clue.
'NERO' can be found hidden inside 'insaner old'.

(Other definitions for nero that I've seen before include "Tyrannical Roman emperor" , "Ancient Roman emperor" , "Roman emperor who fiddled while Rome burned" , "Roman emperor on the fiddle?" , "Barbarous Roman emperor" .)

I've seen this clue in The Times.

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