The most common and most likely answer to this crossword clue is the 5 letter word MUDDY
I've seen this crossword clue in Independent
M
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Buddy explains!

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 MUDDY mean?
MUDDY verb- To get mud on (something).
- To make a mess of, or create confusion with regard to; to muddle.
- Covered with or full of mud or wet soil.
- With mud or other sediment brought into suspension, turbid.
- Not clear; mixed up or blurry.
- Confused; stupid; incoherent; vague.
- Soiled with feces.