Lack of recruitment to clinical academic careers is of concern, and may be linked to lack of awareness and promotion of this pathway in undergraduate medical education. Our study explored undergraduate experiences which support academic career progression and potential barriers to pursuing Specialised Foundation roles in the United Kingdom. We adopted a constructivist lens and conducted interviews with specialised foundation programme (SFP) doctors and final year students who had applied for SFP positions. We analysed interview transcripts using reflexive thematic analysis. We recognised four key stages which stimulated and supported students in pursuing a clinical academic career: (1) Lighting the inner spark; (2) Igniting the fire; (3) Feeding the fire; and (4) Seeing through the smoke. Although students showed a strong inner drive, meaningful undergraduate experiences and positive interactions with academics were crucial for sparking academic interests. Participants were more often inspired by their extra-curricular activities than core undergraduate education. Early positive experiences are needed for students to overcome stereotypes and consider clinical academic careers. Medical schools should raise awareness of clinical academic careers early on, ensure all students have opportunities to participate in relevant activities with academic teams, and develop medical educators and researchers who can engage and inspire others.