The term 'Turtle Cover' is a reference to the protective SHELL of a turtle. The crossword solution for this term is 'SHELL', which is a five-letter word. The SHELL of a turtle is a hard, protective covering that helps to protect the turtle from predators and other environmental threats. It also provides insulation and helps the turtle to regulate its body temperature. The SHELL is made up of several layers of keratin, which is a protein found in the skin and nails of humans and other animals.