His tomb is in Red Square (5)
I believe the answer is:
lenin
'his tomb is in red square' 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" , "Leader of the Russian Revolution" , "V. I. -, Soviet politician and revolutionary" , "Linen for Communist" , "Russian revolutionary" .)