Might they be working at last? 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 rest of the clue works.

Can you help me to learn more?

(Other definitions for cobblers that I've seen before include "Shoe repairers" , "Sole fitters" , "More than one at last" , "fruit drinks" , "fruit pies" .)

I've seen this clue in The Telegraph.

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