Possible Clues:

• Does one lose one's standing by putting one's foot in it?
• Fall through with item of footwear
• Such footwear makes him lose his footing
• One drinking cautiously goes around left shoe
• Skid with this underfoot
• Ripples (anag.)
• Last product worn at home?
• Comfortable footwear
• Safety first - edge by on foot
• Item of footwear salesman sent back by mistake