The most common and most likely answer to this crossword clue is the 7 letter word GABBING
G
A
B
B
I
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Buddy explains!

The straight part
We know that "idle chatter" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case idle chatter = gabbing.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 GABBING mean?
GABBING verb- To jest; to tell lies in jest; exaggerate; lie.
- To talk or chatter a lot, usually on trivial subjects.
- To speak or tell falsely.