Possible Clues:

• Three notes about misbehaving class -- it's seen by staff?
• Symbol for the lower piano music part
• Staff sign half-hearted complaint about naughty class
• Musical stave marking
• Scored symbol on fish caught by port, mainly
• Low pitch indicator (2 words)
• Baritone line starter
• Fish caught by the French fishermen primarily - for the staff, that's noteworthy?
• Low pitch indicator, in music
• Ear-shaped musical symbol