Security devices seen overhead? (5)
I believe the answer is:
locks
'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" .)