She does not mean pure entertainment without subsistence. Rather what she means is that teaching must involve enthusiasm, insight, understanding, and occasionally good humor. Classes should be enjoyable and stimulating. High-quality teachers are also very concerned about their discipline and bringing the best of their discipline to bear on issues of content, advising, and curricula. Teaching means that we have something to profess.
Substance is critical.
Service means representing the discipline by giving guest lectures to wider audiences, conducting and participating in workshops for interested groups, writing and doing research, especially on teaching, and sitting on committees concerned with teaching and curricula.