Suitable containers (5)
I believe the answer is:
cases
'containers' is the definition.
(I know this)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for cases that I've seen before include "Pieces of luggage and legal proceedings" , "Law-suits or boxes" , "Lawsuits or travelling containers" , "Lawsuits or pieces of luggage" , "patients" .)