Related Clues:

• Twice halved
• "___ bitten . . ."
• Opportunity's frequency
• Fairy-tale beginning
• How coffee filters are used
• First word of 'The Raven'
• 'There was a time ...'
• "___ bitten, twice shy"
• In olden days
• In days of yore
• Second word in many a limerick
• Without repetition
• Once in a blue moon
• Never again
• Back in time