Crossword Genius

Violet Elizabeth reading out last three pieces from Keats for anniversary? (9)

Ross

I believe the answer is:

eightieth

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'violet' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I don't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for eightieth that I've seen before include "Tee it high (anag)" , "Ordinal number" , "final day of circumnavigation" , "A fraction equal to one-and-a-quarter percent" .)

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