The most common and most likely answer to this crossword clue is the 7 letter word RADDLES
R
A
D
D
L
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S
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The straight part
We know that "Thrashes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case thrashes = raddles.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 RADDLES mean?
RADDLES noun- A red ochre.
- A long, flexible stick, rod, or branch, interwoven with others between upright posts or stakes, in making a kind of hedge or fence.
- A hedge or fence made with raddles.
- An instrument consisting of a wooden bar, with a row of upright pegs set in it, used by domestic weavers to keep the warp of a proper width and prevent tangling when it is wound upon the beam of the loom.