The term 'LIKE TONTO'S MASKED FRIEND' is a reference to the character of The LONE Ranger, a fictional masked cowboy who was the protagonist of a long-running American radio and television series. The LONE Ranger was accompanied by his Native American companion Tonto, and the two of them fought for justice in the American Old West. The term 'LONE' is a 4-letter solution to this crossword puzzle, and it is an appropriate description of The LONE Ranger.