Cryptic crossword clue
Sound of male flies in marsh plants 9

The most common and most likely answer to this crossword clue is the 9 letter word BULRUSHES

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "marsh plants" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case marsh plants = bulrushes.
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 BULRUSHES mean?

BULRUSHES noun
  1. Any of several wetland plants, mostly in the family Cyperaceae (the sedges):

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