Possible Clues:

• What water-pipes should be kept behind?
• Was slow to get the piping clad
• Fell behind; insulated
• A gee-gee was first on the outside but fell behind
• When it was too slow a horse got led around
• Boy carrying bomb around fell behind
• Fell behind others
• Wrapped for warmth
• What water pipes should be kept behind?
• Was straggling