The phrase "indirect way" means doing something without doing it directly or in a straightforward manner. It involves using a different approach or strategy to achieve a goal or convey a message. Full definition
Improving external sales channel performance is a more indirect way of generating revenue with your online training course. (elearningindustry.com)
Keep in mind that your partner may support your business in indirect ways as well, such as financial support while you start a new venture or emotional support in hard times. (entrepreneur.com)
However, the researchers also tested a more indirect way of assessing how a person feels (i.e., their automatic attitudes). (scienceofrelationships.com)