Related Clues:

• Like gentlemen's agreements
• It makes the grade
• Type of surgeon
• Word with history or hygiene
• Type of thermometer
• Classroom trial
• Type of hygiene
• Type of dental-school exam?
• Word with litmus or taste
• Try out
• Makeup, e.g.
• Word-of-mouth
• Like some contracts
• See 18-Across
• Sound engineer's word