The term 'Sail Securer' is a job title for someone who works on a boat, specifically someone who is responsible for the safety of the sails. The job requires the person to ensure that the sails are properly secured and in good condition. The crossword solutions for this term are 'MAST', which is the vertical pole that supports the sails. The MAST is an important part of the sailboat and must be properly secured in order for the sails to function properly.