The case of a miniature (6)

I believe the answer is:

locket

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'the case' is the definition.
(locket is a kind of case)

I don't understand the remainder of the clue.

(Other definitions for locket that I've seen before include "Small case on pendant, may hold photo" , "Small ornamental case, often contains photo" , "Case hung round the neck, containing a photo" , "Small pendant containing photo" , "Picture-case on chain" .)

I've seen this clue in the Evening Standard.

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