Clue: Postal ref.

Answer: APO

Length: 3

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Similar Clues:

• "Whiffenpoof" refrain (BAABAA with 6 letters)
• Refuge, as from a storm (SHELTER with 7 letters)
• Refrains from taking (LEAVES with 6 letters)
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• "Ah, I didn't know what you were referring to" (OHTHAT with 6 letters)
• Refuse to believe (e.g. DENY with 4 letters)
• Refined fossil fuel (GAS with 3 letters)
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