The most common and most likely answer to this crossword clue is the 9 letter word SARCASTIC
S
A
R
C
A
S
T
I
C
More clues leading to the result SARCASTIC
- Biting as Arctic’s winds
- Cutting rotten carcass with it
- Scornful Russia’s sneaky, non-U act against Clinton’s lead
- Contemptuous racists unfortunately held up bill
- Sneering horrible racist supporting South Africa gets caught
- Mocking actors in Indian dress, cold
- Using scornful language, artist’s upset by actors in charge
- Mocking theatrical airs around performers approaching clubs
- Mocking actors in Indian dress, beginning to chant
- Sneering South American Catholic takes wine before beginning of communion
Buddy explains!

The straight part
We know that "Cynical" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cynical = sarcastic.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 SARCASTIC mean?
SARCASTIC adjective- Containing sarcasm.
- (of a person) Having the personality trait of expressing sarcasm.