Related Clues:

• Proficient in
• On top of
• Fairy-tale preposition
• Conver-sant with
• At the time of
• 'Once -- a time ...'
• Sitting atop
• It often follows 'once'
• Word often following 'once'
• "__ the Roof" (Drifters song)
• Hip to
• Read -- (study)
• Fairy-tale word
• Having studied
• Informed of