Related Clues:

• Supine's opposite
• Tending
• Flat on one's stomach
• Likely (to)
• Lying flat
• Back up?
• Prostrate
• Lying face down
• Disposed (to)
• Lying face-down
• Face down
• Lying face down or likely to do something
• Apt to be lying
• Tummy-to-the-ground
• That's 26 across