The term 'OUST, LEGALLY' can be summarized by two crossword solutions: DISBAR and EVICT. DISBAR is a legal term meaning to remove a lawyer from the practice of law, usually due to unethical or illegal behavior. EVICT is a legal term meaning to remove someone from a property, usually due to non-payment of rent or other breach of contract. Both terms involve legally removing someone from a situation, hence the term 'OUST, LEGALLY'.