Crossword Genius

Security device (4)

Ross

I believe the answer is:

lock

'security device' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for lock that I've seen before include "Bolt" , "..., stock and barrel" , "Secure a piece of hair" , "temporary container for lighter, say" , "Secure - position in rugby team" .)

I've seen this clue in the Penny Press, The Telegraph and The Times.
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