Related Clues:

• Source of vexation
• Telemarketer, to many
• Unwelcome garden visitor
• Nuisance of bank's personal interest
• Garden interloper
• Real pain
• Little brother, stereotypically
• Fly, e.g
• Trying type
• Step out and be a nuisance
• Nag, e.g
• Cockroach, e.g
• Tick, e.g
• Robocaller, e.g
• Mosquito, gnat or fly