The term 'TREATS UNFAIRLY' can be broken down into two crossword solutions: SHAFTS (6 letters) and STICKSITTO (10 letters). Shafts are long, thin objects that are used to transmit power or motion, such as a drive shaft in a car. Sticksitto is an informal phrase meaning to persist in doing something despite difficulties or opposition. Together, these two words suggest that someone is being treated unfairly and is continuing to persist in spite of it.