Answer: pun

AnswerCrossword Clue
PUNKnock-knock joke payoff
PUNOne may not be intended
PUNJeu de mots
PUNTricky puzzle clue, perhaps
PUNKnock-knock joke, essentially
PUN"Shoot first and ask Christian Slater," e.g.
PUNEquivoque
PUNNo ... intended
PUN"Whirred play," for example
PUNGroaner
PUN"My bike won't stand up. It's two tired," e.g.
PUN"Doing a crossword with a broken pencil is pointless," for example
PUN"Don't be fuelish," e.g.
PUN"Some nylons will give you a run for your money," e.g.
PUN"New kid on the blog," e.g.
PUNSomething that may not be intended
PUNMany a Groucho Marx quip
PUNOgden Nash specialty
PUNPunch line, perhaps
PUNTom Swifty, e.g.
punto make a play on words
PUN"Treat homonyms as synonyms": Walter Redfern
PUNPlay on words
PUN"Silent knight," e.g.
PUNBit of wordplay
PUNPlay on a name, say
PUNNo .. intended
PUN"A pistol let off at the ear": Charles Lamb
PUNGroucho Marx specialty
PUNBerle specialty
PUNNash specialty
PUNCrossword clue, sometimes
PUNIt may not be intended
PUNKnock-knock joke, usually
PUNWordplay groaner
PUNAccording to Oscar Levant, it's "the lowest form of humor--when you don't think of it first"
PUNGroan inducer
PUNMany a joke involves one
PUN"I'd like to study philosophy, but I just Kant," e.g.
PUN"When the smog clears in California, UCLA," e.g.