Related Clues:

• One of 'the highest form of literature,' per Hitchcock
• "Noah kept bees in the ark hive," e.g
• Groan cause, perhaps
• Seller initially taken in by customer, a joker
• 'The lowest form of wit,' they say
• Joke with a homophone, say
• "A horse is a stable animal" is one
• Bit of Ogden Nash wordplay
• 'The lowest form of humor—when you don't think of it first': Oscar Levant
• "The lowest form of humor—when you don't think of it first": Oscar Levant
• 'Horse voice,' e.g
• ''Sherwood Florist,'' e.g
• Bit of wordplay from Groucho
• The clue for 58-Down, e.g. [sorry!]
• 'Sign language is pretty handy,' e.g