Not just any type of injury (5)
I believe the answer is:
wrong
'not just' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for wrong that I've seen before include "Inappropriate" , "Failing to come right" , "Erroneous" , "Unjust - incorrect" , "bad" .)