Crossword Genius

Notes contents of this small case (6)

Ross

I believe the answer is:

wallet

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'case' is the definition.
(I know that wallet is a type of case)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for wallet that I've seen before include "A man's pocketbpook" , "Notecase" , "Money-holder" , "Small case for paper money" , "Pocket case for money and documents" .)

I've seen this clue in The Telegraph.
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