The most common and most likely answer to this crossword clue is the 5 letter word PLEAS
I've seen this crossword clue in Financial Times
P
L
E
A
S
Buddy explains!

The straight part
We know that "Entreaties" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case entreaties = pleas.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 PLEAS mean?
PLEAS noun- An appeal, petition, urgent prayer or entreaty.
- An excuse; an apology.
- That which is alleged or pleaded, in defense or in justification.
- That which is alleged by a party in support of his cause.
- An allegation of fact in a cause, as distinguished from a demurrer.
- The defendant’s answer to the plaintiff’s declaration and demand.
- A cause in court; a lawsuit; as, the Court of Common Pleas.
- To plead; to argue.