The crossword solution for the term 'QUACK CREATION' is 'NOSTRUM', which is a seven-letter word. A NOSTRUM is a medicine or remedy that is often ineffective and potentially dangerous, and is usually sold with false claims of its effectiveness. The term is derived from the Latin word 'NOSTRUM remedium', meaning 'our remedy'. Quackery is the practice of promoting such remedies, and so a 'quack creation' would be a NOSTRUM.