The term 'Subject of Debate' is a phrase used to describe a TOPIC that is open to discussion and argument. It is often used to refer to controversial topics, such as politics, religion, or social issues, which can be difficult to agree on. The term can also be used to refer to any TOPIC that is open to debate, such as scientific theories or philosophical ideas. The five-letter solution to the crossword puzzle for this term is 'TOPIC'.