Workers at last? What nonsense! (8)

I believe the answer is:

cobblers

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'nonsense' is the definition.
(I know that cobblers is a type of nonsense)

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

Can you help me to learn more?

(Other definitions for cobblers that I've seen before include "More than one at last" , "Shoe workers - nonsense!" , "Shoe-menders" , "fruit pies" , "They used the last" .)

I've seen this clue in the Sydney Morning Herald.

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