The most common and most likely answer to this crossword clue is the 6 letter word MOROSE
I've seen this crossword clue in The Times
M
O
R
O
S
E
More clues leading to the result MOROSE
- Dour old male knocked over wine
- Run into huge beast and you'll get gloomy
- Got up after a moment, in a sulk
- Doctor got out of bed in a bad mood
- Gloomy, ordinary seaman on board again
- Moody Maureen meets another woman
- After a short time wine makes one anything but cheerful
- Gloomy doctor stood up
- Miserable doctor was promoted
- Surly animal crossing river
Buddy explains!

The straight part
We know that "anything but cheerful" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case anything but cheerful = morose.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 MOROSE mean?
MOROSE adjective- Sullen, gloomy; showing a brooding ill humour.