A trick is a clever or cunning plan or scheme, often used to deceive or outwit someone. It can also refer to a clever or amusing action or device used to achieve a desired result. The term 'a trick' is often used in card games, where it refers to a specific set of cards that can be used to gain an advantage over an opponent. In the crossword, the answer ITS is an acronym for 'Innovative Tactics and Strategies, ' which are often used in card games to gain an advantage.