1d. advanced, of machines. ?I?? ?E?H
3d. institution teaching etiquette. ?H??? S?H???
7d. undercover work. ???I???G?
57d. take off weight. S?I?
14a. boat hunting very large sea mammals. ???L??
21a. north sea fuel. ??T?R?L ?A?
27a. play along in good manner. ?E ? S???T