The crossword solution for the term 'Precursor to a Big Flop?' is TERA, which is an acronym for Total Extinction Risk Assessment. This is a process used to assess the risk of a species becoming extinct due to human activities. It is used to identify and prioritize conservation efforts in order to prevent species from becoming extinct. The term 'Big Flop' refers to the failure of these conservation efforts, resulting in the extinction of a species.