The most common and most likely answer to this crossword clue is the 8 letter word SETSCREW
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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 SETSCREW mean?
SETSCREW noun- A screw with threads along the entire length and no head. Typically, set screws have a hex or slot drive recessed in the threaded length; a grub screw or worm screw.
- Any screw used to hold or adjust a setting: frequently a set screw (sense 1), but may also be any other machine screw or thumb screw used for the purpose of setting.
- (NZ) A screw with a head, usually hexagonal, like a bolt but without a shank to allow it to screw into material rather than take a nut; a tap bolt.