Related Clues:

• "Long ___ ..."
• 'Long, long ___ ...'
• "Long, long ___ ..."
• What may come after a long time?
• For a single time only
• An attempt before now
• Certainly not often
• Something one trying had in the past
• Best Musical Tony winner between 'The Book of Mormon' and 'Kinky Boots'
• Start of a reminiscence
• Start of many a fairy tale
• Musketeers' slogan about to be adopted decisively
• Never before, never again
• __ in a blue moon
• Self-conceited somewhere inside in the good old days