Franklin D —, president of the US from 1933-45 (9)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
roosevelt
(Other definitions for roosevelt that I've seen before include "One of two US presidents" , "Leading statesman in war" , "See president" , "Surname of 26th and 32nd US presidents" , "32nd US president, Franklin" .)