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Secret files and a disc to be formatted (10)

Ross

I believe the answer is:

classified

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'secret' is the definition.
(similar in meaning)

I cannot understand how the rest of the clue works.

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(Other definitions for classified that I've seen before include "Ordered" , "Categorised; secret" , "to be kept secret" , "Arranged in categories" .)

I've seen this clue in The Guardian.
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