The term 'SINGS LUSTILY' can be broken down into two crossword solutions, 'TROLLS' and 'BELTS'. 'TROLLS' is a six-letter word that refers to a mythical creature from Scandinavian folklore, typically depicted as a grotesque humanoid. They are often portrayed as singing and dancing in the forests. 'BELTS' is a five-letter word that refers to a band or strap worn around the waist to hold clothing or other items in place. It can also refer to a vocal technique used by singers to emphasize certain notes or words. Therefore, the term 'SINGS LUSTILY' can be interpreted as a combination of the two crossword solutions, suggesting that someone is singing with a loud and passionate voice, like a troll in the forest.