Possible Clues:

• Formal garden
• One leaving army grouping in level ground
• Get is wrong with egghead following division of fancy flower garden
• Seating area on the ground floor of a theatre
• One goes about producing flower arrangement
• Exercises involving skill go wrong in garden area
• Behind divider, note arrangement of beds
• Flower bed or beds
• Path-filled garden
• Feature of theatre role — having boob exposed at the start