The crossword solution for the term 'Sassy Trio' is 'ESSES', which is an acronym for the three female singers known as the Supremes. The Supremes were a popular Motown singing group in the 1960s and 1970s, consisting of Diana Ross, Mary Wilson, and Florence Ballard. They are best known for their hit songs such as 'Stop! In the Name of Love' and 'Baby Love'. The trio was known for their sassy style and stage presence, and they remain one of the most successful girl groups of all time.