The term 'evasive one' can be described by two crossword solutions: EEL (3 letters) and ELUDER (6 letters). An EEL is a type of fish that is known for its ability to move quickly and unpredictably, making it difficult to catch. Eluder is a synonym for evader, which means someone who avoids or escapes from something. Therefore, the term 'evasive one' can be used to describe someone who is able to avoid or escape from a situation.