Related Clues:

• Knock lightly; a valve
• Knock when the postman turns up
• Water source; take advantage of
• Exploit unfinished recording
• Light blow; draw sap from (tree)
• Exploit non-violent strike
• Take advantage of water supply
• Apt penalty
• Penalty that is a turn on!
• Return for a penalty from Pat
• Apt penalty on the rugby field?
• Get money from, strike
• Usually a quickly taken penalty
• It is apt to take this penalty quickly
• Lightly strike