Related Clues:

• Fact finder, say
• One in a class by himself
• One getting instruction
• Register signer
• Stravinsky, to Rimsky-Korsakov
• Intern
• One-on-one learner
• Student of optometry?
• One in training
• Iris part
• The opening of an iris
• Erudite one
• Joiner
• Certain student
• Learned sort