The most common and most likely answer to this crossword clue is the 6 letter word MANURE
I've seen this crossword clue in Financial Times
M
A
N
U
R
E
More clues leading to the result MANURE
- No longer occupy island, unconditional leader having been deposed
- Something mucky and something hairy outside ancient city
- Fellow clean, having removed soft muck
- Hellenic character’s covered in horse dung
- What’s produced by horse eating a couple of nuts?
- Greek character covered with horse dung
- Gardener’s assistant, bloke with flower
- Fertilizer made from initially melted and then processed urea infused with Nitrogen
- Football club respecting enrichment
- Muck football team about
Buddy explains!

The straight part
We know that "dung" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dung = manure.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 MANURE mean?
MANURE noun- Animal excrement, especially that of common domestic farm animals and when used as fertilizer. Generally speaking, from cows, horses, sheep, pigs and chickens.
- Any fertilizing substance, whether of animal origin or not; fertiliser.
- Rubbish; nonsense; bullshit.
- To cultivate by manual labor; to till; hence, to develop by culture.
- To apply manure (as fertilizer or soil improver).