Crossword Genius

Security devices seen overhead? (5)

Ross

I believe the answer is:

locks

I'm a little stuck... Click here to teach me more about this clue!

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

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for locks that I've seen before include "Tresses" , "Secure fasteners for doors" , "Clusters of hair" , "Securely fixes" , "Secures; person's hair" .)

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