The crossword solution for the term ONE-THIRD OF A WAR FILM is TORA. This is a reference to the 1970 American war film 'Tora! Tora! Tora!', which is a dramatization of the Japanese attack on Pearl Harbor in 1941. The film is split into three parts, with each part focusing on a different perspective of the attack. The first part focuses on the Japanese side, the second part focuses on the American side, and the third part focuses on both sides.