Related Clues:

• Stretch of high moorland
• Wiped out, as while skateboarding
• Fell face-first
• Toppled over
• Flopped, funds-wise
• Fell rapidly
• Took a major loss
• Knock down chap that emits a cry of pain
• Brutal — high moorland
• Faceplanted, say
• Bring down hill
• Fine extension: hide collapsed floor
• Ruthless, poet
• Tripped and fell, perhaps
• Fell on one's face big-time