Related Clues:

• Obeyed a flasher
• Hit the brakes
• Decelerated
• Became exhausted
• Went from 60 to 40, e.g.
• Applied the brakes
• Lost speed
• Put on the brakes
• Reduced speed
• Was not so fast as 9 across, perhaps
• Unfastened?
• Lost steam
• Impeded
• Poet eating nothing with daughter, blooming exhausted
• Tapped the brakes