Cry of discovery (6)
I believe the answer is:
eureka
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cry of discovery</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for eureka that I've seen before include "Triumphant exclamation of discovery" , "I've got it!" , "Cry of joy on finding something" , "Discovery announcement" , "Exultant cry" .)