The crossword solution for the term 'START OF TREASON?' is 'LESE', which is a French word meaning 'to commit a crime against the state or its ruler'. It is used to describe an act of treason, which is defined as the betrayal of one's country by acting to overthrow its government or to harm its interests. Lese-majeste, a specific form of treason, is the crime of violating the dignity of a reigning sovereign or state.