The term 'Defender of a Cause' can be summarized as a PALADIN, which is a seven-letter word. A PALADIN is a heroic champion who is devoted to a cause and is willing to fight for it. Historically, Paladins were associated with Charlemagne's court in the Middle Ages, and they were known for their bravery and loyalty. In modern times, Paladins are often seen as defenders of justice and truth, and they are often seen as symbols of courage and strength.