Possible Clues:

• Remains behind after public knowledge of winner's mentality at the Curragh perhaps
• Remains behind after public knowledge of winner's mentality at Cheltenham
• Lingers past, as the welcoming time
• Is harder to get rid of than unfashionable corset
• Surpasses in endurance
• Lasts longer than unfashionable ladies' underwear
• Waits around too long to expose 'remains'
• Lasts longer than unfashionable underwear
• Remains too long