Related Clues:

• Analyst's phrase
• "Now that makes sense"
• Indication of a green light
• ''It's clear to me''
• Acknowledge silently
• '10-4'
• "Ah, gotcha!"
• Use your head positively?
• 'Oh, of course!'
• Wordless OK
• Wynken and Blynken's companion
• Why isn't one done?
• St. Nicholas gives one in 'A Visit From St. Nicholas'
• Visibly agree
• "Aha, now ___"