Related Clues:

• At the crown
• It often follows 'once'
• Word often following 'once'
• At the highest point
• "__ the Roof" (Drifters song)
• Lying on
• On the apex
• Hip to
• Read -- (study)
• Fairy-tale word
• Having studied
• Informed of
• Using as a roost
• "___ the Roof" (Drifters song)
• Heading