Related Clues:

• Insist
• Spur (on)
• Press, as to vote
• Skin infection
• It may be uncontrollable
• Strong inclination
• The munchies, for one
• Reason to scratch one's head?
• It may be hard to resist
• Impulsive feeling
• Try to convince
• Spur, with "on"
• Advocate forcefully
• Prompt, in a way
• Addict's bugbear