Possible Clues:

• Only one of the four has become a sailor boy
• Salt, maybe
• Easter ___ (period up to Pentecost Sunday)
• Period of year for working on mains?
• eg.Summer
• Perhaps a sailor boy - one of four
• Particular time (for activity, conditions etc)
• Summer perhaps when boy goes to the briny
• Sprinkle salt on, perhaps
• Add condiments