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Crackers -- or what you'll need them for? (4)

Ross

I believe the answer is:

nuts

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'crackers' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

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(Other definitions for nuts that I've seen before include "Bonkers" , "Beans" , "Mad; seeds" , "Metal fasteners" , "Fruits; insane" .)

I've seen this clue in The Telegraph.
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