Related Clues:

• 'Great Caesar's ghost!'
• Reaction to a surprise ending, perhaps
• Edwardian expletive
• Sudden intake of air
• Gaps in struggle for breath
• Short sharp intake of breath
• Struggle for breath with open mouth
• Puff, struggle for breath
• Inhale sharply with astonishment
• Short laboured intake of breath
• Around the South it's open to have a breather
• Father is back, for instance, by Jove!
• The South sounded astonished to be in space
• Gee, it's poisonous enough to be the death of one at last
• This one of 21 across may be the last