Showing expertise is a term used to describe the ability to demonstrate a high level of skill or knowledge in a particular area. The term can be used to describe a person's performance in a job, or in any other activity. In this case, the crossword solution for the term is 'ADEPT, ' which means having or showing knowledge, skill, or aptitude in a particular field. Adeptness is often seen as a sign of expertise, and it is a quality that is highly valued in many professions.