Related Clues:

• Strap to sharpen razors
• The wine is up to make one keen.
• So to reverse to the harbours and make it sharp
• The harbour up to make it sharp
• The wine has turned; That's what makes it so sharp
• Wine is up to make one sharp
• The harbour's up there and make it sharp (5)
• Up with the drinks, and be sharp about it
• Wine is back to make it sharp
• Put a point on it back there at the points of entry
• Apply to an emery wheel
• Work on, as one's skills
• Barber's chair attachment
• You might rub a knife across it
• Perfect, perhaps