Crossword Genius

Description of advert not meant for wide distribution? (10)

Ross

I believe the answer is:

classified

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If this is the answer I cannot explain how the clue works.

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

I've seen this clue in The Independent.
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