Related Clues:

• It's a 'terrible thing to waste'
• Stomach strengthener
• Lend an ear to
• ''What's that I hear?''
• Pay careful attention to
• Follow the orders of
• Refer (back)
• With 21-Across, extreme will power, literally
• Abs strengthener
• Evince interest
• Object to
• Rise partly
• Follow the advice of
• __ Reader
• 'Listen up!'