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Greek craft said to test lots of paper (8)

Ross

I believe the answer is:

triremes

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'greek' is the definition.
Although both the answer and definition are nouns, they are not in the same form of the noun. However, I know that 'greek' relates to this answer.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for triremes that I've seen before include "boats" , "Galleys" , "They had three banks" .)

I've seen this clue in the Sydney Morning Herald.
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