The term 'member of a caste system' can be summarized as someone who is part of a social hierarchy based on birth. This type of system is often found in India and other parts of South Asia, where people are divided into different social classes based on their family's status. The crossword solution for this term is 'ANT', which is a reference to the fact that members of a caste system are often seen as being part of a larger collective, like ants in a colony.