Having these at Christmas is insane? (8)

I believe the answer is:

crackers

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'is insane?' is the definition.
(similar in meaning)

I cannot understand how the remainder of the clue works.

(Other definitions for crackers that I've seen before include "and some others touched" , "Christmas items" , "full of bad jokes at Yuletide?" , "Pulled at parties!" , "Biscuits; fireworks" .)

I've seen this clue in The Times.

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