The term 'devious trick' can be broken down into two crossword solutions: WILE (4 letters) and FASTONE (7 letters). WILE is defined as a clever or cunning stratagem, while FASTONE is defined as a clever or witty remark. Both terms refer to a type of trickery or deception that is used to gain an advantage over someone else. Devious tricks are often used in order to manipulate or deceive someone in order to get what one wants.