Possible Clues:

• Here's praise at one that cannot live alone
• Self-interested hanger-on
• Animal that feeds off another
• That sucker sucks a spare with it
• Creature that lives off others
• The ruination of parties a hanger-on can be
• That sucker will have you for a sucker
• Hanger-on found in military drop zone?
• A sponger's father tries a corrective
• As usual, a position for a hanger-on