Possible Clues:

• Piece placed on top of cricket stumps
• Security - part of wicket
• Remove water from a boat with a container
• How to get the prisoner or the water out
• It may be skipped or jumped
• Topper for stumps
• Partition in stable that may be jumped
• It's often posted
• Perhaps a bouncer's clog dance
• One may be out on it or out when it's off