Russian front led by one? (4)
I believe the answer is:
ivan
'russian' is the definition.
(I've seen this before)
'front led by one?' is the wordplay.
'front' becomes 'van' (I've seen this before).
'led by' says to put letters next to each other.
'one?' becomes 'i' (Roman numeral).
'van' after 'i' is 'IVAN'.
(Other definitions for ivan that I've seen before include "Name of six Russian tzars" , "One Day in the Life of - Denisovich (Solzhenitsyn)" , "Chap" , "A Russian emperor, quite Terrible" , "Russian ruler - a Terrible one" .)