The most common and most likely answer to this crossword clue is the 6 letter word CRABBY
C
R
A
B
B
Y
More clues leading to the result CRABBY
- Irritable — as one being shelled?
- Cry-baby mostly unsettled and grouchy
- Taxi driver collects queen in a bad mood
- Irritable passenger in the end picked up by driver
- Nipping sideways possibly, cross
- Bad-tembered taxi driver crossing river
- Taxi driver circling King’s Cross
- King of music in racy novel that’s short
- Out of sorts, express sadness about university offer?
- Irritable driver introduces rule
Buddy explains!

The straight part
We know that "not happy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not happy = crabby.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 CRABBY mean?
CRABBY adjective- Visibly irritated or annoyed; grouchy, irritable, in a foul mood; given to complaining or finding fault in an annoyed way.
- Crabbed; difficult, or perplexing.