Excellent example of rudimentary instruction (5-5)

I believe the answer is:

first-class

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This might be a double definition.

'excellent' is the first definition.
(I know that excellent can be written as first-class)

'example of rudimentary instruction' is the second definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

Can you help me to learn more?

(Another definition for first-class that I've seen is " Top flight".)

I've seen this clue in The Globe and Mail.

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