The term 'LEFT, AT SEA' can be solved by two crossword solutions: PORT (4 letters) and APORT (5 letters). PORT is a noun that refers to a place on the coast where ships can dock and unload cargo. It is also used as a verb to describe the act of docking a ship at such a place. APORT is an adverb that means 'toward the left side of a ship'. This phrase is often used to describe the direction in which a ship is sailing.