Crossword Genius

Presumably Plato expressed this or did I read that in his Apology? (5)

Ross

I believe the answer is:

greek

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This might be a double definition.

'presumably plato expressed this or did i read that in his' is the first definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'apology?' is the second definition.
The answer and definition 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?

(Other definitions for greek that I've seen before include "Mediterranean native" , "Person from Athens" , "From Thessaloniki, perhaps" , "Athenian?" , "Nationality" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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