Related Clues:

• Pretzel shapes
• Tough posers
• Plumb-line measures
• Ocean recesses
• Pine feature
• Word that can follow the starts of 17-, 23-, 51- and 59-Across
• MacramŽ makeup
• Maritime distances
• Yacht units
• Clusters
• Ship-speed units
• Granny and clove, e.g.
• Lowest part
• 1,852-meter units
• Ocean abysses