Possible Clues:

• With no power, be economical?
• Roused when seen as Rod? Rubbish!
• Vain American embracing tennis player
• Incompetent being this would make fuse start to fail
• Not worth a penny
• Of no help at all
• Not worth a plugged nickel
• Poor American English the French start to speak
• Unproductive former tennis star entering America
• It's no good merely urging people to be economical