Related Clues:

• Bet a follower for the letter
• Bet a follower comes to the letter
• This one of 21 across may be the last
• Bet a letter follows this
• Bet the first of 5 down would make the whole lot of them
• Last gasp comes at last and leaves one quite breathless
• Beat a sound of a follower of this
• Ater this, bet a letter
• 'Unbelievable!' noise
• "Unbelievable!" noise
• Start of a series of 24
• Leader in Athens?
• Sound dumbfounded
• [Oh my God!]
• Exclaim breathlessly