Cry of sudden insight (6)

I believe the answer is:

eureka

(Other definitions for eureka that I've seen before include "'I've made a discovery!'" , "Triumphant exclamation of discovery" , "Exclamation of triumph" , "county seat in 23 [CALIFORNIA]" , "Archimedes's call of triumph" .)

I've seen this clue in The Times.

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