The crossword solution for the term 'A ___ AS GOOD AS A MILE' is MISSIS, which is a six-letter word. Missis is an informal term used to refer to a married woman, especially one who is older than the speaker. It is derived from the French word 'maîtresse', which means 'MISTRESS'. The phrase 'A missis as good as a mile' is used to describe something that is as good as it can be, or as reliable as it can be.