The crossword solution for the term 'CHEEP SOURCE' is 'NEST'. A NEST is a structure built by certain animals, such as birds, to provide a safe place to lay eggs and raise young. It is often made from twigs, grass, and other materials found in the environment. Nests are usually built in trees, but can also be found in shrubs, on the ground, or even in human-made structures. Nests are an important source of food for many species, as well as providing shelter and protection from predators.