Clue: Explorers' org.

Answer: 2 possible answers to Explorers' org.. From 3 to 4 leters.

Explorers' org. answers with 3 characters:

• BSA

Explorers' org. answers with 4 characters:

• NASA

---

Similar Clues:

• Organizational core (CADRE with 5 letters)
• Early explorers (DISCOVERERS with 11 letters)
• Concern of organized labor? (STATEOFTHEUNION with 15 letters)
• Tablet named for an organ (TUMS with 4 letters)
• High-tech organizers (abbr.) (PDAS with 4 letters)
• Organic vegetable container (PEAPOD with 6 letters)
• Mouth organs (TNGS with 4 letters)
• Photosynthetic organisms (ALGAE with 5 letters)
• Worldwide crime-fighting organization (INTERPOL with 8 letters)
• Sight organ (EYE with 3 letters)