Related Clues:

• Masters them to get inside the rust
• Learn from them that there's an R in stout?
• It's a bit fishy when trout's teach lessons at university
• Teachers' noises of disapproval about men
• Coaches crumbling to rust
• Sign of disapproval, or strangeness of teachers?
• Homework helpers
• Teaches one-on-one
• Trouts swimming in school
• Teachers, usually of individual students rather than classes
• Teachers make disapproving sound or shout at the front
• Instructs privately
• Lesson givers
• Teachers of French you sort out
• Private coaches