The crossword solution for the term 'Like Mr. X' is ANON, which is a four letter word. ANON is an abbreviation of the phrase 'ANONYMOUS, ' which means without a name or identity. It is often used to describe someone who does not want to be identified, such as a person who posts online without revealing their real name. In this context, it could refer to someone who is similar to Mr. X in that they do not want to be identified.