The most common and most likely answer to this crossword clue is the 8 letter word BADINAGE
I've seen this crossword clue in The Guardian
B
A
D
I
N
A
G
E
More clues leading to the result BADINAGE
- Banter not good for the elderly?
- Mark engaging in a bit of playful repartee
- Repartee deficient amongst the elderly?
- Drollery good during early years, but …
- Banter for a badge?
- Ribbing rotten, in time
- Being a dad briefly involved frivolous repartee
- Teasing gets unpleasant in advancing years
- Poor batting, then time for banter
- Amusing repartee is second-rate these days and in decline
Buddy explains!

The straight part
We know that "frivolous repartee" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case frivolous repartee = badinage.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 BADINAGE mean?
BADINAGE noun- Playful raillery; banter.
- To engage in badinage or playful banter.