Possible Clues:

• Roger Bannister, memorably
• Track runner
• Athlete who's not dashing?
• Half-hearted storyteller is one who competes in the long run
• Pre-metric middle-distance runner
• Specialist on a running track
• Athlete who may run four laps
• Coe, perhaps, scratching front of Beamer
• Someone beaming, heading off track athlete?
• Bib wearer outdoors