Pass on painting that’s cut up (5)

I believe the answer is:

dunno

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'pass' is the definition.
(both might be said in order to skip a question)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for dunno that I've seen before include "Informally, pass" , "I don't know (informal)" , "I've no idea!" , "It beats me" , "No idea (informal)" .)

I've seen this clue in The Guardian.

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