The term 'HERO'S HERO' can be solved by the crossword solution LEANDER, which is a 7-letter word. Leander was a character in Greek mythology who was known for his bravery and strength. He was in love with the priestess Hero, and swam across the Hellespont every night to meet her. When a storm destroyed the bridge of boats that he used to cross the strait, he drowned and Hero committed suicide in grief. Leander thus became a symbol of devoted love and heroism, making him a fitting answer to the clue 'HERO'S HERO'.