Centrepieces of Minoan bounty really nominal (6)

I believe the answer is:

nounal

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'nominal' is the definition.
Both the answer and definition are adjectives.
Perhaps there's a link between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for nounal that I've seen is " Like name".)

I've seen this clue in The Independent.

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