Secures access codes (4)
I believe the answer is:
pins
I believe this clue is a double definition.
'secures' is the first definition.
(pinning is a kind of securing)
'access codes' is the second definition.
(PIN numbers for accessing bank accounts)
(Other definitions for pins that I've seen before include "Wire fasteners" , "With needles, they create a tingling sensation" , "Stocking fillers" , "security codes" .)