Related Clues:

• The way to get to the ground
• Gain ground
• Apply to an emery wheel
• Work on, as one's skills
• Tedious work
• You might rub a knife across it
• Perfect, perhaps
• Make sharp
• Gain an edge
• Laborious stuff
• Increase keenness?
• Hone the right to be informed?
• It's hard work getting a number in here
• Give point to singular female's grasp of French surrealist
• It's hard work to get name in here