Related Clues:

• In one's ear, it's a stinging rebuke
• Leaping parasites
• That's the one to jump into bed with you
• Little nippers for the spring
• How the sprite comes back, as they're on the hop
• There's bound to be a market for this
• Greyhound stowaway?
• FRONTLINE target
• Annoying parasite
• Leaping insects
• They dog dogs
• Circus insect
• Lab coat speck?
• Canine irritant
• Metaphor for insignificance