Covering hospital admission of boxer? (5)

I believe the answer is:

hijab

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'covering' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for hijab that I've seen before include "Some females may use this" , "Cover" , "Headscarf worn by some Muslim women" , "Muslim head covering" .)

I've seen this clue in The Independent.

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