The most common and most likely answer to this crossword clue is the 5 letter word YENTA
Y
E
N
T
A
Buddy explains!
The straight part
We know that "Gossipmonger's" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case gossipmonger's = yenta.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 YENTA mean?
YENTA noun- A woman who meddles in the business of others; a busybody; a female gossipmonger.
- (Jewish) A matchmaker; a woman who specializes in finding spouses.