Related Clues:

• Air race marker
• 'Witch's Hat' on the road
• Power tower
• Tower for guiding pilots
• Traffic guide
• Tower or tall post
• Metal structure for carrying overhead cables
• Steel tower supporting high-tension wires
• a sound way to pile this on in current use
• By the sound of it, heap it on to keep up the line
• You can put a heap of power on it, by the sound of it
• By the sound of it, make a heap on it in current use
• By the sound of it, heap on what's high in current use
• Only the end of this might make a sound heap, currently
• Penny only engineered gear for the ESB