The term 'straightens (up)' can be broken down into three crossword solutions: 'cleans' (6 letters), 'NEATENS' (7 letters), and 'TIDIES' (6 letters). All three words refer to the act of making something orderly, neat, and presentable. Cleaning involves removing dirt, dust, and other debris from a surface. Neatening involves arranging items in an organized manner. Tidying involves putting things in their proper place. Together, these three words describe the process of straightening up, or making something look neat and tidy.