Can't fix formats misapplied in children's book (9,2,3)

I believe the answer is:

fantastic mr fox

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'can't fix formats misapplied in children's book' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'can't fix formats misapplied in children's book' is the wordplay.
'can't fix formats' anagrams to 'FANTASTIC MR FOX'.
Though, I am unsure how the anagram is indicated.

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.

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