Possible Clues:

• Jerking movement
• Jerk starting trouble is capable of casting a spell over someone
• Jerk, by implication, is to look for birds
• Quiver
• Appear nervous, supplying toe of newt to necromancer
• Quiver or contract spasmodically, as eye may
• Fool attending church, the jerk!
• Justin.tv successor
• Uncontrolled, short, jerky motion
• Spasmodic jerk