Concealing something from customs, depending on circumstances? (2,3,4,3,2)
I believe the answer is:
as the case may be
'depending on circumstances?' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for as the case may be that I've seen before include "Carried on board or stored in hold" , "Depending on the particular circumstances (2,3,4,3,2)" , "according to circumstances?" , "Open and shut, perhaps" , "Accordingly" .)