The term 'DAMSEL's Rescuer' can be broken down into two crossword solutions: HERO (4 letters) and WHITEKNIGHT (11 letters). A HERO is traditionally defined as a person who is admired for their courage, outstanding achievements, or noble qualities. A white knight is a metaphor for someone who comes to the rescue of another in a difficult situation. In this context, a white knight is someone who rescues a DAMSEL in distress.