While global changes affect each single agricultural area, we wonder to what extent Geographical Indications can sustain the typicity of terroir products? To tackle this question, we investigated the factors influencing the quality of Corsican clementine under a Protected Geographical Indication (PGI) by using a multi-level approach, from the farmer's field to the whole actor network. We used an analytical framework articulating concepts and insights from three scientific fields: Farming System approach, Geographical Indications studies, and the Multi-Level Perspective on transitions. Data collection was carried out via two complementary means. On the one hand, we conducted a Regional Agronomic Diagnosis in order to understand the effect of farming practices on fruit acidity (acidity plays a key role in the sensorial quality of Corsican clementines). On the other hand, we carried out an analysis of the sociotechnical system, with the aim of understanding the economic and social drivers of farming practices.