Fur tycoon John Jacob ___ (5)
I believe the answer is:
astor
'fur tycoon john jacob' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for astor that I've seen before include "First female MP" , "Nancy --, one-time MP" , "female parliamentarian" , "See 2" , "First woman to sit in the House of Commons, d. 1964" .)