Crossword Genius

Noble discovered Marie Stopes half wasted away (6)

Ross

I believe the answer is:

aristo

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'noble' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for aristo that I've seen before include "Nob" , "Toff" , "Owned by the state" , "one of the best" , "High-hat" .)

I've seen this clue in The Telegraph.
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