Crossword Genius

Hospital leaving injured protected? (5)

Ross

I believe the answer is:

armed

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'protected?' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

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(Other definitions for armed that I've seen before include "With a piece" , "brachiate?" , "Bearing weapons" , "Like Mars" , "equipped for fighting" .)

I've seen this clue in The Guardian.
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