Crossword Genius

It once earned the nickname "poudre de succession" ("inheritance powder") (7)

Ross

I believe the answer is:

arsenic

(Other definitions for arsenic that I've seen before include "Powerful poison" , "Poisons in scare" , "killer" , "Toxic metalloid element" , "Ratsbane" .)

I've seen this clue in The New York Times.
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