The term 'X, FOR ONE' can be solved by the crossword solutions AXIS (4 letters) and BRAND (5 letters). An AXIS is a straight line about which a body rotates or may be symmetrically arranged. It is also used to refer to a central line of an object or a system. A BRAND is a name, symbol, or other feature that distinguishes one seller's product from those of others. It is used to identify and differentiate products and services in the marketplace.