A grand plan is a large-scale, comprehensive plan that is designed to achieve a particular goal. It is often used to refer to a plan of action that is intended to have a long-term effect. The term 'grand plan' can also be used to describe a plan that is ambitious and far-reaching. In this context, the crossword solution for the term 'grand plan' is 'SCHEME, ' which is defined as a plan or program of action intended to accomplish a specific purpose.