Possible Clues:

• Position of special prominence
• Most important position
• Most important position for The Lions in 23 down? For Old French it's nearly all those in 20 down!
• Copperfield rewritten retains area as special location
• Prominent position
• Applied force, popping the most noticeable spot
• Ground Force applied to get coveted position
• Copperfield flies around a special location
• Most prominent position
• Copper failed to be moved into the most important position