Possible Clues:

• Attention brought to article that reduces shocking risks
• The object is to get one sound with spades
• Some spadework for so sound an object
• Take a spade to it for a hearing aid, perhaps
• Spade work for the hearing aid?
• The object is quite sound enough to be doing something sound in the garden
• A sound object for work in the garden (8)
• The object is to make it sound when there's lightning
• Going to ground with a hearing device, possibly
• Might one get to work on a hearing-aid with a shovel?