Possible Clues:

• Contradiction in terms
• Figure of speech
• Contradictory figure of speech
• ''Jumbo shrimp,'' for one
• A half of oxygen gets to the 29 down for contradiction
• 'Deafening silence', for example — or on my ox (anag)
• Figure of speech conjoining contradictory terms
• Deafening silence, e.g.
• Neat youth leader meeting fool's living death, for example
• 'Old news,' for one