American Fur Company founder (5)
I believe the answer is:
astor
'american fur company founder' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for astor that I've seen before include "Nancy --, one-time MP" , "female parliamentarian" , "See 2" , "First woman to sit in the House of Commons, d. 1964" , "First female MP" .)