Author of War and Peace (7)
I believe the answer is:
tolstoy
'author of war and peace' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for tolstoy that I've seen before include "Writer of War and Peace, d.1910" , "Lost toy of the Russian author" , "Great Russian author of 'War and Peace'" , "Russian novelist" , "Russian writer, 1828-1910" .)