Possible Clues:

• At the . . . . . . . . hour, the last minute
• Not the last hour to put the escape in the heel (8)
• Way-out in the heel of the 25th down
• The hour to be saved at in the nick of time
• In the surroundings of the loch for the last hour
• The surroundings of the loch for the last man in
• The last part of the last of 4 across
• It happens to be inside for the last hour
• The loch is in there the last hour
• The loch in the setting of the last of a side