All the suits put in a case (4)

I believe the answer is:

pack

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'case' is the definition.
(packing is a kind of casing)

I can't explain the rest of the clue.

(Other definitions for pack that I've seen before include "Parcel" , "Stow" , "Group of scouts" , "Stuff - rucksack" , "Set, band; carton" .)

I've seen this clue in The Guardian.

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