The most common and most likely answer to this crossword clue is the 8 letter word WOUNDING
I've seen this crossword clue in The Times
W
O
U
N
D
I
N
G
Buddy explains!
The straight part
We know that "Causing injury to" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case causing injury to = wounding.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does WOUNDING mean?
WOUNDING verb- To hurt or injure (someone) by cutting, piercing, or tearing the skin.
- To hurt (a person's feelings).
- The act of inflicting a wound.
- An instance of being wounded.