Poetry from Lear is rubbish (8)

I believe the answer is:

nonsense

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'is rubbish' is the definition.
(I've seen this before)

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

(Other definitions for nonsense that I've seen before include "Baloney" , "Humbug!" , "Quick look" , "Words or ideas that don't make sense" , "Foolish behaviour" .)

I've seen this clue in The Sun.

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