Protectors, perhaps, used in boxing (5)

I believe the answer is:

cases

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'protectors' is the definition.
(I know this)

I can't explain the remainder of the clue.

(Other definitions for cases that I've seen before include "patients" , "Baggage" , "Keeps a close eye on" , "Bags" , "Pieces of luggage and legal proceedings" .)

I've seen this clue in the Evening Standard.

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