Crossword Genius

Potassium in European waste material: I found it (6)

Ross

I believe the answer is:

eureka

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'material i found it' is the definition.
I can't tell whether this defines the answer.

'potassium in european waste' is the wordplay.
'potassium' becomes 'K' (K is the chemical symbol for potassium).
'in' indicates putting letters inside.
'european' becomes 'E' (abbreviation e.g. EU).
'waste' becomes 'urea' (compound in urine).
'e'+'urea'='eurea'
'k' inserted within 'eurea' is 'EUREKA'.

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(Other definitions for eureka that I've seen before include "'I have found it!' (Greek)" , "Archimedes's cry of discovery" , "Exultant cry" , "alloy" , "Triumphant exclamation of discovery" .)

I've seen this clue in The Times.
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