The term 'Turned Informer' can be described by two crossword solutions: 'RATTED' (6 letters) and 'SANG' (4 letters). 'RATTED' is a slang term meaning to inform on someone, usually to the authorities. 'SANG' is an informal term meaning to confess or admit to something, usually to the authorities. Together, these two words describe someone who has gone from being a criminal to becoming an informant for the authorities.