Spooner's contemptible chef collected records (8)

I believe the answer is:

casebook

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'collected records' is the definition.
(collection of records of cases)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for casebook that I've seen before include "Medical records" , "Record of legal or medical instances" , "Where detailed written records are kept by, say, doctors" , "compiled by doctor for famous consultant" , "Record of work" .)

I've seen this clue in The Times.

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