Clue: Letters of uncertainty

Answer: TBA

Length: 3

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Similar Clues:

• Sched. uncertainty letters (TBA with 3 letters)
• Post-office alert letters (AKA with 3 letters)
• Office building problem that's a hint to this puzzle's theme entries (see their last three letters) (RECYCLEDAIR with 11 letters)
• Post office poster letters (AKA with 3 letters)
• Box office letters (SRO with 3 letters)
• Box-office letters (SRO with 3 letters)
• Post office letters (COD with 3 letters)
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• Letters that are not at the post office (EMAIL with 5 letters)