Roman satirist is not pure, sadly (9)

I believe the answer is:

petronius

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'roman satirist' is the definition.
The definition suggests a singular noun which matches the answer.

'is not pure sadly' is the wordplay.
'sadly' indicates anagramming the letters.
'is'+'not'+'pure'='isnotpure'
'isnotpure' is an anagram of 'PETRONIUS'.

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(Another definition for petronius that I've seen is " Roman author of Satyricon".)

I've seen this clue in The Independent.

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