Clean Dirty Money is a term used to describe money that has been illegally obtained and then 'CLEANED' through a process known as money laundering. Money laundering is the process of disguising the source of illegally obtained money by transferring it through a series of transactions in order to make it appear legitimate. The crossword solution for this term is 'LAUNDER', which is a 7 letter word meaning to clean or purify something, especially money, by means of a financial transaction.