Related Clues:

• With 1-Down, every seven days
• "... __ and for all!"
• Start of an epic spaghetti western
• At some past point
• '... bitten, twice shy'
• On just one occasion
• On a single occasion only
• Just as a single occurrence
• Not often, seldom
• At one time
• Hardly ever, most infrequently
• Not very often, seldom in fact
• '. . . . bitten, twice shy'
• Seldom, not frequently
• One time only