Red Square name (5)
I believe the answer is:
lenin
'red square name' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lenin that I've seen before include "Vladimir Ilyich Ulyanov, d. 1924" , "Soviet Union's first premier" , "Revolutionary leader" , "Marxist theoretician" , "Vladimir Ilyich -, Soviet premier" .)