Related Clues:

• ''Sincerely,'' and others
• Completes a sales day
• "Yours truly" and others
• Seals up
• Flips the "Open" sign
• One never wins under a hundred like this, so one just shuts up
• OSE x 150?
• It's not the Open that the hundred does not win
• There's no opening for one who mislays things by the hundred
• It's just no win after the century
• Makes less & Co and doesn't come first at last
• Winds up clock initially and then forgets
• "Sincerely" and others
• Goes last
• Wind up clock at the outset, then it doesn't gain