The term 'OLD SOLDIER, A CAMP ENTERTAINER' can be summarized as a Redcoat, which is a seven-letter word. A Redcoat was a nickname given to the British soldiers who served in the British Army during the 18th and 19th centuries. They were also known for their role as camp entertainers, providing music and other forms of entertainment to the troops. The term 'Redcoat' is still used today to refer to any soldier who has served in the British Army.