The crossword solution for the term 'have an in (with)' is RATE. This term is often used to describe a situation where two or more people are involved in a discussion or negotiation. It can also be used to describe the level of agreement between two parties, such as when two people have reached a consensus on a particular issue. In this context, having an in (with) someone means that both parties are willing to listen to each other and come to an agreement.