Artist with museums in Vitebsk, Belarus, and Nice, France (7)

I believe the answer is:

chagall

(Other definitions for chagall that I've seen before include "Russian-born painter" , "Marc -, twentieth century Russian-born French artist" , "Marc --, Russian-French artist" , "Marc --, Russian artist" , "He painted" .)

I've seen this clue in The Wall Street Journal.

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