The answer to the crossword for the term 'THINK SINGER' is ARETHA (6 letters). ARETHA Franklin was an American singer, songwriter, and pianist who is widely regarded as one of the most influential singers of all time. She began her career as a gospel singer in her father's church and went on to become a successful recording artist, earning the title 'Queen of Soul'. Her most popular songs include 'RESPECT', 'THINK', and 'Chain of Fools'.