Clue: Bygone covert org.

Answer: OSS

Length: 3

---

Similar Clues:

• Organ knobs: Abbr. (STPS with 4 letters)
• Bygone pol. cause (ERA with 3 letters)
• Organizations (Abbr.) (ASSNS with 5 letters)
• Organic unit (CELL with 4 letters)
• Like a bygone empire (INCAN with 5 letters)
• Organized excursions (TOURS with 5 letters)
• Move covertly (SLINK with 5 letters)
• Bygone love interest (OLDFLAME with 8 letters)
• Obsessive organizers (NEATFREAKS with 10 letters)
• Of simple organisms (AMOEBIC with 7 letters)