The term 'Slimmer SWIMMER' is a combination of two words, 'slimmer' and 'SWIMMER'. The crossword solution for this term is 'EEL', which is a type of fish that is known for its slender body shape and ability to swim. Eels are found in both saltwater and freshwater habitats and can be found in many parts of the world. They are also known for their long, snake-like bodies and their ability to move quickly through the water.