Russian writer Turgenev (4)
I believe the answer is:
'russian writer turgenev' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ivan that I've seen before include "__ Lendl, Czech-born American tennis star" , "'Terrible' emperor of Russia" , "First tsar of Russia" , "Russian ruler - a Terrible one" , "One Day in the Life of - Denisovich (Solzhenitsyn)" .)