Clue: Essence of a knock-knock joke

Answer: PUN

Length: 3

---

Similar Clues:

• Essence of knock-knock jokes (PUNS with 4 letters)
• Knock for ___ (astonish) (ALOOP with 5 letters)
• Source of the sample in Jay-Z's "Hard Knock Life (Ghetto Anthem)" (ANNIE with 5 letters)
• Lock or knock attachment (ANTI with 4 letters)
• Knock or social attachment (ANTI with 4 letters)
• Venus de Milo knock-offs? (ARMS with 4 letters)
• Italian's answer to a knock (AVANTI with 6 letters)
• Knock-down, drag-out affairs (BRAWLS with 6 letters)
• Knock-down-drag-out affairs (BRAWLS with 6 letters)
• Knock alternative (DINGDONG with 8 letters)