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Absurd sketch Rothko initially disowned (4)

Ross

I believe the answer is:

daft

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'absurd' is the definition.
(thesaurus)

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(Other definitions for daft that I've seen before include "Idiotic" , "Scatty" , "'---- as a brush': dotty" , "Informally crazy as a brush" , "Half-witted" .)

I've seen this clue in The Telegraph.
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