In today's evolving educational landscape, the 'broker teacher' plays a pivotal role. These educators manage cross-sector partnerships involving government, business and non-profit sectors to introduce innovative practices in schools. This study seeks to explore broker teachers' nuanced roles and the perceptions, which have not yet been extensively studied. Applying the Zaltman Metaphor Elicitation Technique, our research focuses on broker teachers in Hong Kong, investigating how they enact their roles and influence innovative practices through these partnerships. By focusing on the perspective of broker teachers, this study diverges from previous research that often concentrated on schools' external partners. As such, the study highlights the unique challenges and opportunities that broker teachers face as agents of change. In three case studies, we show how broker teachers align their roles with the stakeholders' expectations during school initiatives. The findings unearth the dynamic nature of broker teachers' roles, highlighting the need for explicit role definitions and robust support structures. These elements are fundamental for broker teachers to effectively navigate the complexities of cross-sector partnerships and to drive sustainable educational reforms.