Related Clues:

• Safe, at sea
• Avoiding blows?
• 'Hard ___!' (sailor's yell)
• First course
• Primary artery
• Blood vessel
• Primary blood carrier
• Hard follower, at sea
• Safe, asea
• Vital part of systemic circulation
• Sheltered on a ship
• Vital supply line
• Less affected by gusts
• Life line?
• On the calmer side, nautically