The term 'ONE's stuff' can be summarized by two crossword solutions: STRUT (5 letters) and ESTATE (6 letters). STRUT is a verb meaning to walk or stand in a proud, confident manner. It is often used to describe someone who is showing off their possessions or accomplishments. ESTATE is a noun referring to the property owned by an individual, including land, buildings, and other assets. It is often used to refer to the total wealth of a person, including their possessions, investments, and other financial holdings.