The term 'PARTY PURCHASE' can be broken down into three crossword solutions: ICE (3 letters), KEG (3 letters), and PAPERPLATES (11 letters). ICE is a frozen form of water that is used to keep food and drinks cold. Kegs are large metal containers that are used to store and dispense beer. Paper plates are disposable plates made from paper that are often used for parties and other events. All three items are commonly purchased for parties, hence the term 'PARTY PURCHASE'.