Use it to secure locks? (7)

I believe the answer is:
hairpin
(Other definitions for hairpin that I've seen before include "Bit of metal" , "grip?" , "Nasty road bend or aid to coiffure" , "associated with locks" , "U-shaped fastener" .)
I believe the answer is:
hairpin
(Other definitions for hairpin that I've seen before include "Bit of metal" , "grip?" , "Nasty road bend or aid to coiffure" , "associated with locks" , "U-shaped fastener" .)