Related Clues:
- Secret kind of coteries
- Understandable by only an enlightened inner circle
- Requiring secret or mysterious knowledge
- Mysteriouss or secret
- Abstruse, mysterious
- Mysterious to all but a chosen few
- Secret or mysterious
- Intelligible only to informed people in coteries
- Ace ran, being mysterious
- Secret and mysterious
- Abstruse, arcane
- Intelligible only with special knowledge
- Mysterious like a crane
- 'Abstruse, arcane (8)'
- Understood by only a few people