The most common and most likely answer to this crossword clue is the 8 letter word MORASSES
I've seen this crossword clue in The Daily Telegraph
M
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R
A
S
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More clues leading to the result MORASSES
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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 MORASSES mean?
MORASSES noun- A tract of soft, wet ground; a marsh; a fen.
- Anything that entraps or makes progress difficult.