Marie’s medical unit (5)

I believe the answer is:

curie

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'unit' is the definition.
(curie is a kind of unit)

I don't understand the rest of the clue.

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

I've seen this clue in the Evening Standard.

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