The term CLINGING CRUSTACEAN is an 8-letter word that can be solved by the crossword solution BARNACLE. Barnacles are a type of crustacean that attach themselves to rocks, ships, and other hard surfaces in the ocean. They have a hard shell and use their long, feathery legs to filter food from the water. Barnacles are an important part of the marine ecosystem, providing food for many species of fish and other animals.