Related Clues:

• Mosquito or mole, e.g.
• Fly, perhaps
• 17-Across in the neck
• Annoying bug
• Irksome one
• Pony
• Pain in the ass
• Badger, so to speak
• No thoroughbred
• Grouse like a spouse
• Find fault to a fault
• One who 26-Across
• Tired old horse
• The horse to annoy continually
• Destructive insect or nuisance