Unit of radioactivity (5)

I believe the answer is:

curie

'unit of radioactivity' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for curie that I've seen before include "Unit of radioactivity" , "measure of radioactivity" , "Marie ---, found radium" , "Marie --, discoverer of Radium" , "Marie --, French chemist" .)

I've seen this clue in The Times, the Canadiana, The Telegraph, the Wall Street Journal and the New York Times.

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