Related Clues:

• Words of comprehension
• Word of assent
• 'Uh-huh'
• Authorize
• Understanding words
• 'Gotcha!'
• Words of understanding
• Psychiatrist's response
• Words of enlightenment
• Hunky-dory
• 'Deal!'
• Allowable
• 'Now it's clear!'
• 'Oh, right!'
• See 20-Across