Crossword Genius

Crazy contribution to diet? (4)

Ross

I believe the answer is:

nuts

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'crazy' is the definition.
(nuts can informally mean crazy or mad)

I can't explain the remainder of the clue.

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(Other definitions for nuts that I've seen before include "Edible seeds with hard shells" , "Hard-shelled fruits or seeds" , "Unbalanced" , "Got a screw loose" , "Eccentric; coal lumps" .)

I've seen this clue in the Evening Standard.
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