The term 'go-to guy' is used to describe someone who is an EXPERT in their field and is relied upon for their knowledge and skills. This person is often the main person in charge of a project or task. The crossword solutions for this term are ACE (3 letters), EXPERT (6 letters), WIZ (3 letters), and MAINMAN (7 letters). ACE is a term used to describe someone who is very skilled at something, EXPERT implies someone who has a great deal of knowledge and experience in a particular area, WIZ is another word for a genius or someone who is very knowledgeable, and MAINMAN is a term used to describe someone who is the leader or main person in charge of a project or task.