Medical injury? Put under protection, avoiding A & E (6)
I believe the answer is:
insult
'medical injury?' is the definition.
(insult can mean a type of internal injury)
I don't understand the remainder of the clue.
(Other definitions for insult that I've seen before include "Treat with contempt" , "A deliberately offensive remark" , "Treat with abuse" , "Affront, offend" , "Slight - affront" .)