Goodness supplied by food I turn into crackers (9)

I believe the answer is:

nutrition

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'goodness' is the definition.

'i turn into crackers' is the wordplay.
'crackers' indicates an anagram (informal term for mad).
'i'+'turn'+'into'='iturninto'
'iturninto' is an anagram of 'NUTRITION'.

'supplied by food' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.

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(Other definitions for nutrition that I've seen before include "Food, its study" , "Food, nourishment" , "Act of nourishing" , "form of sustenance" , "Food and drink, edibles" .)

I've seen this clue in The Times.

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