Roscoe —, winner of the January, 1977 Australian Open singles tennis championship (6)
I believe the answer is:
tanner
(Other definitions for tanner that I've seen before include "Person who converts hides into leather" , "Curer of hides, maker of leather" , "Leather maker or old sixpence" , "He cures hides, for an old sixpence" , "Old sixpenny piece" .)