Nuts? You'll need these (8)

I believe the answer is:

crackers

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'nuts?' is the definition.
(both can informally mean mad)

I don't understand the rest of the clue.

(Other definitions for crackers that I've seen before include "nuts and > bananas" , "full of bad jokes at Yuletide?" , "Not being sensible" , "Crazy (colloq.); biscuits" , "Christmas items" .)

I've seen this clue in The Globe and Mail.

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