Box without risk (4)
I believe the answer is:
safe
'box' is the definition.
(safe is a kind of box)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for safe that I've seen before include "Secure - place in the bank" , "Iron box in which to keep money or important papers" , "Free from risk" , "Secure cupboard" , "Strong metal box to store valuables" .)