Related Clues:

• Bottom feeder
• Badger, in a way
• 21-Across. e.g.
• Horse unlikely to win a race
• Remind annoyingly
• Keep bothering
• Be a shrew
• Annoy by persistent faultfinding
• Fault-find
• Koi
• Harpy
• Pester continuously
• Find fault with fish?
• Sick bay?
• Continuously bother