Possible Clues:

• Of no purpose
• Vain American touring chooses to ignore Connecticut
• Advice to economise - no good at all
• Employ fewer in vain
• Don't consume so much rubbish
• Vain - unavailing
• Otiose
• Without any worthwhile application
• No good so to merely encourage economy
• Encouragement not to be extravagant? You're wasting your breath