Possible Clues:

• Understand female cutting party short
• Unit of length equal to six feet, used to measure depths of water
• Six feet from a swear word on wavelength
• Six feet in depth; grasp
• Work out depth of water
• Understand fine party's to end early
• 11 of 9's sound
• Understand female leading party in house? Not quite
• Think in depth
• Nautical unit of measure