Related Clues:

• Unsung
• Hidden, as a threat
• Make unclear, indistinct, or blurred
• Devious devil touring East in disguise
• Cover old bulb at either end with sulphur and salt
• Baffling note found in course work
• Unclear — recondite
• Meriting a (var.) tag, say
• Hardly well-known
• Humble old boy sure to catch cold
• Disguised, as a threat
• “I strive to be brief, and I become ____” (Horace)
• Enigmatic alumnus tested outside clubs
• Shady old boy's remedy
• Hide former pupil's medicine