Related Clues:

• Groundbreaking, in a way
• Opposite of small
• Mike, in breaking lock, shows key
• Majorly influential
• The __ Dipper
• Ground-breaking railway shunned by academy adjoining line
• Orwell's reality show?
• Important American soldier returned after onset of battle
• Influential discussion group with U-turn at the end?
• Crucially influential
• Sizeable British force on the ground
• Generous portion of grub I got
• Flower up — incredibly strong
• Mighty or potent
• Highly original if missing from the last-but-one round