Security device — not luck (anag) (7)
I believe the answer is:
locknut
(Other definitions for locknut that I've seen before include "What can securely fasten" , "Safety device on a bolt" .)
I've seen this clue in The Guardian.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.