Harm or injure (6)
I believe the answer is:
damage
I believe this clue is a double definition.
'harm' is the first definition.
(I know that harm can be written as damage)
'injure' is the second definition.
(I know that injure is a more specific form of damage)
(Other definitions for damage that I've seen before include "Harm, loss" , "'Deface, impair (6)'" , "Harm, impair" , "To vandalise" , "vandalism?" .)