Related Clues:

• A catboat has just one
• Ship's structural part
• Keeping an even one is recommended
• Aerial support
• Main part of a ship's structure
• Captain's ___ (naval disciplinary hearing)
• Whipping site at sea?
• Faint, with "over"
• It runs from stem to stern
• Upright pole
• Ship spar
• Support at sea
• Nautical stabilizer
• A crow's-nest tops it
• Boat backbone