Possible Clues:

• Annoying idiot's rushing around
• Giving a hard time
• Vaughan (reversed) + Emulate Vaughan = Badgering
• Ha! The artists break into song just to be annoying
• Hang around, as Sir, to such an annoying extent
• Bothering to go racing off to catch donkey
• Making crank calls, e.g.
• The girl is back to be the vocalist - it's all extremely annoying
• On one's case