Possible Clues:

• Straight cryptic definition for example
• Figure of speech in which contradictory terms are used together
• Deafening silence, perhaps, after Oscar axes dunce
• "Jumbo shrimp," e.g
• Unbiased opinion, e.g
• A juxtaposition of contradictory terms; 'military intelligence' for example
• Old news, e.g
• 'Original copy' or 'open secret'
• ''Original copy'' or ''alone together''
• 'Definite maybe' or 'open secret,' e.g