The crossword solutions for the term 'D, FOR ONE' are 'CELL' (4 letters) and 'Lowmark' (7 letters). CELL is a term used to describe the basic structural unit of all living organisms. It is the smallest unit of life that can perform all the functions necessary for life. Lowmark is a financial term used to describe a company's credit rating. It is a measure of how likely a company is to default on its debt obligations.