Long March leader (3)
I believe the answer is:
mao
'long march leader' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mao that I've seen before include "Communist leader of China" , "Chinese statesman" , "- Zedong, Chinese communist leader" , "Former Chinese leader" , "Great Chinese leader . . . Tse-Tung (3)" .)