Crossword Genius

Loser, full of ego, short of 50%, used to celebrate victory (9)

Ross

I believe the answer is:

triumphal

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

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