Heading up is a term that can be used in many contexts. In the context of this crossword, it is defined by the solution 'RISING', which is a six-letter word. This term can refer to a person or thing that is moving upwards, either physically or metaphorically. It can also refer to someone who is in a position of authority or leadership, such as a manager or supervisor. In this sense, heading up can mean taking charge of a situation or leading a group of people.