Republic toppled in 1933 (6)
I believe the answer is:
weimar
(Other definitions for weimar that I've seen before include "13 [THIRD REICH] 's predecessor" , "German town giving its name to 1919-33 republic" , "German republic until 1933" , "German town associated with Goethe, Liszt and Schiller" , "German city; -- Republic" .)