The crossword solution for the term LEAD-IN FOR FRIENDLY is USER, which is a four letter word. USER is a term used to describe someone who uses a computer or other device to access a program, website, or other digital resource. It is also used to refer to someone who interacts with a system or service, such as a customer or client. In this context, USER can be used as a lead-in for friendly, as it implies that the person is interacting with a system in a positive and helpful manner.