The crossword solution for the term 'conniving, with 'IN'' is LEAGUE. Conniving is a form of deception or trickery, usually done IN order to gain an advantage. It is often used to describe someone who is sly and cunning IN their actions. The word 'LEAGUE' can be used to describe a group of people who are united for a common purpose or goal. It can also refer to a group of people who are working together to achieve something. IN this context, it could be used to describe a group of people who are conniving together IN order to gain an advantage.