The most common and most likely answer to this crossword clue is the 4 letter word JOKE
J
O
K
E
More clues leading to the result JOKE
- First person in France to accept passable pun?
- Ordinary fellow describes king in jest
- Uncle Stalin pinching king’s butt
- Root receives Kent cap!
- In Boulogne I caught decent cod
- Funny – if it’s in, then someone’s left out
- Funny story: Take a particular card and cut off its end
- Something funny about John Updike
- Crack all right in aeroplane losing tail
Buddy explains!

The straight part
We know that "cod" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cod = joke.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does JOKE mean?
JOKE noun- An amusing story.
- Something said or done for amusement, not in seriousness.
- The root cause or main issue, especially an unexpected one
- A laughably worthless thing or person; a sham.
- To do or say something for amusement rather than seriously.
- (intransitive, followed by with) To dupe in a friendly manner for amusement; to mess with, play with.
- To make merry with; to make jokes upon; to rally.