Possible Clues:

• Breathes over large lens — turned cold?
• Bug
• Complaint made by one head about learners
• It's contracted
• Ailment comes from cool headland, blowing cold and hot
• One apprentice left with head complaint
• Complaint one's taken to head about two students
• It's not good for one hanging around fringes of illicit business
• Hypochondriac's preoccupation
• It might give you a headache