Related Clues:

• World dodo population
• Sum of opposites
• Number of remaining dodo birds
• Bar closing?
• Operator's number?
• All's counterpart
• Not one at all
• Nothing, nil
• Cipher for nothing
• Nought
• Not any sort of neon
• Not one thing
• Nought, the figure 0
• Nought, nil
• This could give you 27 acrossin a seedy setting