The term 'QUITE PROFICIENT AT' can be summarized as having a high level of skill in a particular area. The crossword solution for this term is 'SKILLED', which implies that the person has a great deal of knowledge and experience in the subject matter. This could refer to any number of areas, such as a craft, a profession, or a hobby. It implies that the person has a great deal of expertise and is able to perform tasks with a high degree of proficiency.