The most common and most likely answer to this crossword clue is the 4 letter word PLED
P
L
E
D
Buddy explains!

The straight part
We know that "alleged in court" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case alleged in court = pled.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 PLED mean?
PLED verb- To present (an argument or a plea), especially in a legal case.
- To beg, beseech, or implore.
- To offer by way of excuse.
- To discuss by arguments.