Crossword Genius

America's first multi-millionaire (5)

Ross

I believe the answer is:

astor

(Other definitions for astor that I've seen before include "First female MP" , "See 2" , "Nancy --, one-time MP" , "Female politician" , "First woman to sit in the House of Commons, d. 1964" .)

I've seen this clue in The Wall Street Journal.
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