The term 'Heads of Staffs' refers to the people in charge of a particular organization or business. The crossword solution for this term is 'clefs, ' which is a French word meaning 'keys.' Clefs are often used as symbols of authority, and they are also used to indicate the key signature of a musical composition. In this context, the term 'clefs' can be interpreted to mean that the heads of staffs are the ones who hold the keys to the success of the organization or business.