The term 'full of animal fat' can be summarized by the crossword solution 'suety'. Suet is a type of animal fat that is solid at room temperature and is used in cooking. It is made from the hard fat found around the kidneys and loins of animals such as cows, sheep, and deer. Suet is often used to make pastry, dumplings, and puddings. It is also used to make suet cakes, which are a popular food for birds.