Cryptic crossword clue
Roger cracks joke in lively party 4

The most common and most likely answer to this crossword clue is the 4 letter word RORT

R
O
R
T

Buddy explains!

The straight part
We know that "lively party" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lively party = rort.
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 RORT mean?

RORT noun
  1. A scam or fraud, especially involving the misappropriation of public money or resources.
RORT verb
  1. To cheat or defraud.

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