Related Clues:

• Many an 'Airplane!' gag
• 30-Across and 48-Across to each other
• Bad humor?
• Cause for a groan
• Cause of a smile, maybe
• Ogden Nash bit
• Crux of some riddles
• It may elicit groans
• Groan inducer
• 'Queen of denial,' e.g.
• Bit of wordplay
• Word games
• Instance of wordplay
• Crossword clue, at times
• Ogden Nash forte