Crossword Genius

Duke with very small amount in ancient vase (5)

Ross

I believe the answer is:

diota

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'ancient vase' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for diota that I've seen is " ancient vase".)

I've seen this clue in The Times and The Sunday Times.
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