Plank is a term used to describe a long, flat piece of material that can be used for a variety of purposes. In the context of this crossword, plank can refer to a POLICY (POLICY), a BEAM (BEAM), WOOD (WOOD), a SHELF (SHELF), a BOARD (BOARD), or PAY (PAY). A POLICY is a set of rules or guidelines that are established by an organization or government to regulate behavior. A BEAM is a long, sturdy piece of material that is used to support a structure. WOOD is a natural material that is commonly used to make furniture and other items. A SHELF is a flat surface that is used to store items. A BOARD is a flat, thin piece of material that is often used for writing or drawing on. PAY is a form of compensation that is given in exchange for work or services.