Explorer who led the first successful expedition to the South Pole (8)
I believe the answer is:
amundsen
(Other definitions for amundsen that I've seen before include "Roald -, Norwegian polar explorer" , "6 24 113 [SCAN-DIN-AVIAN] explorer" , "First man to reach South Pole" , "Norwegian polar explorer, d. 1928" , "Roald --, first to reach the South Pole" .)