Triumphant cry (6)
I believe the answer is:
eureka
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">triumphant cry</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for eureka that I've seen before include "Cry announcing a brilliant discovery" , "Exclamation of triumph" , "Exclamation of triump from Archimedes" , "Archimedes' cry of triumph as he ran naked through the streets of Syracuse?" , "Exclamation of discovery by Archimedes" .)