Terrible name for a Russian ruler (4)
I believe the answer is:
ivan
I believe this clue is a double definition.
'terrible name' is the first definition.
(ref to Ivan the Terrible)
'a russian ruler' is the second definition.
(I've seen this in another clue)
'for' is the link.
(Other definitions for ivan that I've seen before include "Russian, say" , "Chap" , "__ Lendl, Czech-born American tennis star" , "Tsar - 197> the Terrible" , "in Russian history" .)