The term 'alter to fit' can be broken down into three crossword solutions: ADAPT (5 letters), ADJUST (6 letters), and TAILOR (6 letters). ADAPT means to make minor changes to something in order to make it suitable for a new purpose or situation. ADJUST means to change something slightly in order to improve it or to make it more suitable for a particular purpose. TAILOR means to make or alter clothes to fit a particular person. All three terms refer to the process of making changes to something in order to make it more suitable for a particular purpose.