Possible Clues:

• A loving greeting card sent on February 14th
• February 14th card
• Saint regarded as the patron of lovers
• Saint's fast pointless? It has point
• February lover
• Part of a heart-to-heart exchange
• Item in February's mail
• Roy Harper's first chart album
• It's a lean time in the vine for the love letter
• Card or greeting sent on 14th February