The term 'PARTY LINEUP' can be broken down into two crossword solutions: DIPS (4 letters) and SLATE (5 letters). DIPS is a type of food, usually a creamy sauce or dip that is served with chips or vegetables. It is often used as an appetizer at parties. SLATE is a type of rock that is made up of clay and volcanic ash. It is often used to make tiles, chalkboards, and other items. In the context of a party lineup, it could refer to the order in which guests are invited or the order in which activities are planned.