Protected by a cabinet, as a precaution (2,4)
I believe the answer is:
in case
'as a precaution' is the definition.
(just in case)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for in case that I've seen before include "In order to allow for eventualities" , "Packed" , "for emergency" , "Where traveller may keep clothes" , "For fear that" .)