Possible Clues:

• Place under surveillance when money risked in gambling is wrong
• Keep an eye on Keats' formulation?
• Surveillance mission that takes seconds to disable
• Police action
• Informally, place under surveillance - using sharp stick?
• Second murder demanded police surveillance
• Peg this, only to have the South remove it
• Keep watch on small gate receipts away from home
• Start of strategy to withdraw surveillance
• Kills Dracula not to be at home as police hide in bushes perhaps