Possible Clues:

• The hole in the heel of the last of the side
• Ordinal number
• K's position
• Way out in the heel for the last man in
• Last in at such a late hour?
• The loch is in the last hour
• Last minute
• The hour for making that last bid
• for the last hour,the last one inside,perhaps
• This hour is the latest possible time for doing something