The most common and most likely answer to this crossword clue is the 8 letter word RIPOSTES
I've seen this crossword clue in The Guardian
R
I
P
O
S
T
E
S
Buddy explains!
The straight part
We know that "snappy replies" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case snappy replies = ripostes.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 RIPOSTES mean?
RIPOSTES noun- A thrust given in return after parrying an attack.
- A counter-attack in any combat or any sport
- A quick and usually witty response to a taunt, a retort
- An answer or reply, rapidly uttered, in response to a question or problem
- To attempt to hit an opponent after parrying an attack.
- To respond quickly; particularly if the response is humorous.