Related Clues:

• Important, from the past
• This day is memorable for scarlet missive
• Of a tune, lively and easy to remember
• Of tune, lilting and easy to remember
• Of what is important in the past
• Of tune, pleasant and easily remembered
• Of tune, pleasant and easy to remember (6)
• Scarlet missive to signal memorable day
• Widely known and esteemed
• That's the famous fen, too
• Can't be prominent?
• Might be nothing but cant to a remarkable extent
• When it's important by day to have studied the correspondence, by the sound of it
• Can't make it famous
• That might be just cant from 12 across, for instance