Related Clues:

• Second word in many a limerick
• Without repetition
• Never again
• Back in time
• "Going ___, going ..."
• At the moment when
• Start of a tale
• "For ___ in My Life" (Stevie Wonder)
• Not repeatedly
• First in a series
• Quondam
• First word of "The Raven"
• Not currently
• "Going ___, going . . ."
• For ___ (on this occasion)