The most common and most likely answer to this crossword clue is the 6 letter word SWAMPY
S
W
A
M
P
Y
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The straight part
We know that "Wet" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wet = swampy.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 SWAMPY mean?
SWAMPY adjective- Soggy and marshy; wet like a swamp.
- Flowing smoothly with no harsh tones but possibly including muddy tones.