The most common and most likely answer to this crossword clue is the 8 letter word RATCHETS
I've seen this crossword clue in The Daily Telegraph
R
A
T
C
H
E
T
S
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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 RATCHETS mean?
RATCHETS noun- A pawl, click or detent for holding or propelling a ratchet wheel, or ratch, etc.
- A mechanism composed of a ratchet wheel, or ratch and pawl.
- A ratchet wrench.
- (by extension) A procedure or regulation that goes in one direction, usually up.