Related Clues:

• Astride
• Having knowledge of
• Not clueless about
• "Once __ a Mattress"
• Fairy tale preposition
• Get __ a good thing
• Get __ the ground floor
• ''. . . ___ a midnight dreary''
• Not oblivious to
• Lying atop
• ''___ my word''
• "___ a slitted sheet I sit"
• Part of, as a plot
• "Once __ a time ..."
• Barge trailer?