Possible Clues:

• Very small place for driving school's opening in city
• Lil
• Gnat-sized
• So small
• Little, pre-twentyish?
• Very tiny
• Minute steak's first served in New York following shape of a bone
• First part of a rhyming synonym for 'small'
• Really small, informally
• Note Glen, busy getting fifty per cent off Mini