The term 'Sphere of Conflict' refers to a geographical area in which a conflict is taking place. The crossword solution for this term is 'ARENA, ' which can be used to describe the physical space in which a conflict is occurring. This term is often used to refer to a region or area in which a war, battle, or other type of conflict is taking place. It can also be used to describe the broader geopolitical context in which a conflict is occurring.