Possible Clues:

• Unofficial instruction to tell a student what is going on
• Playing well, half-naked and relaxed
• Relaxed boy attending class first
• Relaxed, fill in a line
• In class a student becomes familiar
• Replacing Malachy without ceremony
• Easy setter — female — in run-of-the-mill setting
• Relaxed and casual
• Cosy — loose
• Brief a student -- it's not official