Crossword Genius

Yet it might be something in concrete (8,3)

Ross

I believe the answer is:

abstract art

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'concrete' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for abstract art that I've seen is " Nonrepresentational paintings, sculpture etc".)

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