The term 'TRENDY, '60s-style' can be summarized by the crossword solution MOD, which is an abbreviation for 'modernism'. MOD was a youth subculture that originated in London in the 1960s and was characterized by its fashion sense, music, and lifestyle. The MOD style was heavily influenced by the British music scene of the time, with its focus on modern jazz, soul, and rhythm and blues. The MOD look was characterized by bright colors, geometric patterns, and tailored suits. The MOD lifestyle was also associated with recreational activities such as scooter riding and clubbing.