Crossword Genius

Beat prince — one kept celebrating achievement (9)

Ross

I believe the answer is:

triumphal

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'celebrating achievement' is the definition.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for triumphal that I've seen before include "Showing excessive exultation" , "Celebrating a success" , "Exulting in success" , "Scenting victory" , "characteristic of success" .)

I've seen this clue in The Guardian.
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