Related Clues:

• Put to the grindstone
• Rim … or trim
• It can be the difference between winning and losing
• Give the edge to?
• Sphere's lack
• Place for a fringe
• Drop-off spot
• Head start, maybe
• Athletes look for it
• Hipness
• Work on the edge
• Trim or rim
• Advance slowly
• Neaten, as a lawn
• Apply to a whetstone