Related Clues:

• A tautness sound, as might be heard by drillers
• Awareness - regard
• Call on - stay
• Call on - go to see
• Go to see
• Vigilance
• What is owed
• Call (on)
• Mental concentration
• Amount owing
• Result of a dough shortage?
• Gambler's problem
• Pay a call
• Major American export
• 2012 campaign issue