The most common and most likely answer to this crossword clue is the 10 letter word SCHMOOZING
I've seen this crossword clue in The Daily Telegraph
S
C
H
M
O
O
Z
I
N
G
More clues leading to the result SCHMOOZING
Buddy explains!

The straight part
We know that "Talking idly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case talking idly = schmoozing.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 SCHMOOZING mean?
SCHMOOZING verb- To talk casually, especially in order to gain an advantage or make a social connection.