Dutch dancer born Margaretha Geertruida Zelle executed as a German spy in 1917 (4,4)
I believe the answer is:
mata hari
(Other definitions for mata hari that I've seen before include "Exotic Dutch dancer, executed by the French as a German, 1917" , "Dutch dancer and secret agent, executed in 1917" , "World War I spy" , "Famous female spy" , "Dutch dancer and spy" .)