The crossword solutions for the term 'Crooner Columbo' are RUSS, a four-letter word. Russ Columbo was an American baritone and violinist who rose to fame in the 1930s. He was known for his romantic crooning style and was one of the first singers to use a microphone. His most famous songs include 'You Call It Madness (But I Call It Love)' and 'Prisoner of Love'. He died tragically at the age of 26 in a shooting accident.