Superior example of certain characters (9)

I believe the answer is:

uppercase

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'superior example of certain characters' is the definition.
I can't judge whether this defines the answer.

'superior example' is the wordplay.
'superior' becomes 'upper' (eg an upper house in a parliament).
'example' becomes 'case' (case can mean an example or instance of something).
'upper'+'case'='UPPERCASE'

Can you help me to learn more?

(Another definition for uppercase that I've seen is " Capital letters".)

I've seen this clue in The Mirror.

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