Disturbs a lunatic, one saying silly things? (9)

I believe the answer is:

absurdist

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'one saying silly things?' is the definition.
The definition suggests a singular noun which matches the answer.

'disturbs a lunatic' is the wordplay.
'lunatic' indicates anagramming the letters.
'disturbs'+'a'='disturbsa'
'disturbsa' is an anagram of 'ABSURDIST'.

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I've seen this clue in The Guardian.

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