The crossword solution for the term 'KANGAROO's Pouch, E.G.' is SAC, which stands for 'Suspensory Appendicular Clasp'. This is a specialized anatomical feature of kangaroos, which is a pouch located on the lower abdomen of female kangaroos that is used to carry and protect their young. The pouch is formed by a muscular structure known as the suspensory appendicular clasp, which is unique to kangaroos and other marsupials.