Crossword Genius

Crackers - or what they're required for? (4)

Ross

I believe the answer is:

nuts

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'crackers' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for nuts that I've seen before include "Delivers 24 [HEADBUTT]" , "Metal fasteners" , "Fruits; insane" , "Barmy (colloq)" , "Nibbles" .)

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