The most common and most likely answer to this crossword clue is the 6 letter word PIGSTY
I've seen this crossword clue in Independent
P
I
G
S
T
Y
More clues leading to the result PIGSTY
- Shame about limits of grass in animal enclosure
- Untidy room from which Oink might emerge?
- General Secretary, steeped in compassion, finding place for Wilbur?
- It’s unfortunate about Grammar School being a complete mess
- . Shame to embrace the extremes of godliness for a place far from cleanliness
- Sanctimonious, good and holy man with yen for filthy place
- Shame about empty gardens in Berkshire home
- Scoffs: “politician lacks alternative – dump!”
- Pen good section with feel for describing
- Litter container
Buddy explains!

The straight part
We know that "a complete mess" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a complete mess = pigsty.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 PIGSTY mean?
PIGSTY noun- An enclosure where pigs are kept.
- A dirty or very untidy place.